Permissible Exposure Limits – Annotated Tables
Note: This table only includes occupational exposure limits (OELs) for substances listed in the OSHA Z-1 Table. OELs for hundreds of additional substances have been adopted by Cal/OSHA, NIOSH, and ACGIH. These organizations periodically make revisions to their OELs and so they should be consulted directly for their most current values and substances, as well as special notations such as for skin absorption. The TLVs® and BEIs® are copyrighted by ACGIH® and are not publicly available. However, they can be purchased in their entirety on the ACGIH® website. Permission must be requested from ACGIH® to reproduce the TLVs® and BEIs®. Click here for permission request form.
Substance | CAS No.(c) | Regulatory Limits | Recommended Limits | |||
---|---|---|---|---|---|---|
OSHA PEL(b) | Cal/OSHA PEL(f) (as of 10/2/2019) |
NIOSH REL(g) (as of 10/18/2019) |
ACGIH® 2019 TLV® (h) | |||
ppm(d) | mg/m3(e) | 8-hour TWA (ST) STEL (C) Ceiling |
Up to 10-hour TWA (ST) STEL (C) Ceiling |
8-hour TWA (ST) STEL (C) Ceiling |
||
Acetaldehyde | 75-07-0 | 200 | 360 | (C) 25 ppm | Ca See Appendix A See Appendix C |
(C) 25 ppm |
Acetic acid | 64-19-7 | 10 | 25 | 10 ppm (ST) 15 ppm (C) 40 ppm |
10 ppm (ST) 15 ppm |
10 ppm (ST) 15 ppm |
Acetic anhydride | 108-24-7 | 5 | 20 | (C) 5 ppm | (C) 5 ppm | 1 ppm (ST) 3 ppm |
Acetone | 67-64-1 | 1000 | 2400 | 500 ppm (ST) 750 ppm (C) 3000 ppm |
250 ppm | 250 ppm (ST) 500 ppm |
Acetonitrile | 75-05-8 | 40 | 70 | 40 ppm (ST) 60 ppm |
20 ppm | 20 ppm |
2-Acetylaminofluorene; see 1910.1014 | 53-96-3 | See Section 5209 | Ca See Appendix A |
|||
Acetylene dichloride; see 1,2-Dichloroethylene | ||||||
Acetylene tetrabromide | 79-27-6 | 1 | 14 | 1 ppm | See Appendix D | 0.1 ppm |
Acrolein | 107-02-8 | 0.1 | 0.25 | (C) 0.1 ppm | 0.1 ppm (ST) 0.3 ppm See Appendix C (Aldehydes) |
(C) 0.1 ppm |
Acrylamide | 79-06-1 | 0.3 | 0.03 mg/m3 | Ca 0.03 mg/m3 See Appendix A |
0.03 mg/m3 (IFV) | |
Acrylonitrile; see 1910.1045 | 107-13-1 | 2 ppm Section 5213 |
Ca 1 ppm (C) 10 ppm [15-min] See Appendix A |
2 ppm | ||
Aldrin | 309-00-2 | 0.25 | 0.25 mg/m3 | Ca 0.25 mg/m3 See Appendix A |
0.05 mg/m3 (IFV) | |
Allyl alcohol | 107-18-6 | 2 | 5 | 0.5 ppm (ST) 4 ppm |
2 ppm (ST) 4 ppm |
0.5 ppm |
Allyl chloride | 107-05-1 | 1 | 3 | 1 ppm (ST) 2 ppm |
1 ppm (ST) 2 ppm |
1 ppm (ST) 2 ppm |
Allyl glycidyl ether (AGE) | 106-92-3 | (C) 10 | (C) 45 | 0.2 ppm | 5 ppm (ST) 10 ppm |
1 ppm |
Allyl propyl disulfide | 2179-59-1 | 2 | 12 | 2 ppm (ST) 3 ppm |
2 ppm (ST) 3 ppm |
0.5 ppm |
alpha-Alumina | 1344-28-1 | see PNOR | See Appendix D | See TLV® for Aluminum, metal and insoluble compounds | ||
Total dust | 15 | 10 mg/m3 | ||||
Respirable fraction | 5 | 5 mg/m3 | ||||
Aluminum Metal (as Al) | 7429-90-5 | |||||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | |||
Respirable fraction; | 5 | 5 mg/m3 | 5 mg/m3 | 1 mg/m3 | ||
4-Aminodiphenyl see 1910.1011 | 92-67-1 | See Section 5209 | Ca See Appendix A |
Exposure by all routes should be carefully controlled to levels as low as possible | ||
2-Aminoethanol; see Ethanolamine | ||||||
2-Aminopyridine | 504-29-0 | 0.5 | 2 | 0.5 ppm | 0.5 ppm | 0.5 ppm |
Ammonia | 7664-41-7 | 50 | 35 | 25 ppm (ST) 35 ppm |
25 ppm (ST) 35 ppm |
25 ppm (ST) 35 ppm |
Ammonium sulfamate | 7773-06-0 | |||||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | 10 mg/m3 | ||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
n-Amyl acetate | 628-63-7 | 100 | 525 | 50 ppm (ST) 100 ppm |
100 ppm | 50 ppm (ST) 100 ppm |
sec-Amyl acetate | 626-38-0 | 125 | 650 | 50 ppm (ST) 100 ppm |
125 ppm | 50 ppm (ST) 100 ppm |
Aniline and homologs | 62-53-3 | 5 | 19 | 2 ppm (aniline only) |
Ca See Appendix A |
2 ppm (aniline only) |
Anisidine (o-,p-isomers) | 29191-52-4 | 0.5 | 0.5 mg/m3 | Ca 0.5 mg/m3 See Appendix A |
0.5 mg/m3 | |
Antimony and compounds (as Sb) | 7440-36-0 | 0.5 | 0.5 mg/m3 | 0.5 mg/m3 | 0.5 mg/m3 | |
ANTU (alpha Naphthylthiourea) | 86-88-4 | 0.3 | 0.3 mg/m3 | 0.3 mg/m3 | 0.3 mg/m3 | |
Arsenic, inorganic compounds (as As) see 1910.1018 | 7440-38-2 | 0.01 mg/m3 See Section 5214 |
Ca (C) 0.002 mg/m3 [15-min] See Appendix A |
0.01 mg/m3 | ||
Arsenic, organic compounds (as As) | 7440-38-2 | 0.5 | 0.2 mg/m3 | None | ||
Arsine | 7784-42-1 | 0.05 | 0.2 | 0.05 ppm | Ca (C) 0.002 mg/m3 [15-min] See Appendix A |
0.005 ppm |
Asbestos; see 1910.1001 | Varies with compound | See Section 5208 | Ca 0.1 f/cm3 See Appendix A See Appendix C |
0.1 f/cc (resp. fiber) | ||
Azinphos-methyl | 86-50-0 | 0.2 | 0.2 mg/m3 | 0.2 mg/m3 | 0.2 mg/m3 (IFV) | |
Barium, soluble compounds (as Ba) | 7440-39-3 | 0.5 | 0.5 mg/m3 | 0.5 mg/m3 | 0.5 mg/m3 | |
Barium sulfate | 7727-43-7 | see PNOR | ||||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | 5 mg/m3 (IHL, no asbestos and < 1% crystalline silica) | ||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
Benomyl | 17804-35-2 | See Appendix D | 1 mg/m3 (IHL) | |||
Total dust | 15 | 10 mg/m3 | ||||
Respirable fraction | 5 | 5 mg/m3 | ||||
Benzene; See 1910.1028; See Table Z-2 for the limits applicable in the operations or sectors excluded in 1910.1028(j) | 71-43-2 | 1 ppm (ST) 5 ppm See Section 5218 |
Ca 0.1 ppm (ST) 1 ppm See Appendix A |
0.5 ppm (ST) 2.5 ppm |
||
Benzidine; See 1910.1010 | 92-87-5 | See Section 5209 | Ca See Appendix A See Appendix C |
Exposure by all routes should be carefully controlled to levels as low as possible | ||
p-Benzoquinone; see Quinone | ||||||
Benzo(a)pyrene; see Coal tar pitch volatiles | ||||||
Benzoyl peroxide | 94-36-0 | 5 | 5 mg/m3 | 5 mg/m3 | 5 mg/m3 | |
Benzyl chloride | 100-44-7 | 1 | 5 | 0.03 ppm | (C) 1 ppm [15 min] | 1 ppm |
Beryllium and beryllium compounds (as Be); see 1910.1024(o) | 7440-41-7 | |||||
Biphenyl; see Diphenyl | ||||||
Bismuth telluride, Undoped | 1304-82-1 | |||||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | 10 mg/m3 | ||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
Boron oxide | 1303-86-2 | |||||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | 10 mg/m3 | ||
Boron trifluoride | 7637-07-2 | (C) 1 | (C) 3 | (C) 1 ppm | (C) 1 ppm | 0.1 ppm (C) 0.7 ppm |
Bromine | 7726-95-6 | 0.1 | 0.7 | (C) 0.1 ppm | 0.1 ppm (ST) 0.3 ppm |
0.1 ppm (ST) 0.2 ppm |
Bromoform | 75-25-2 | 0.5 | 5 | 0.5 ppm | 0.5 ppm | 0.5 ppm |
Butadiene (1,3-Butadiene); See 29 CFR 1910.1051; 29 CFR 1910.19(l) | 106-99-0 | 1 ppm / 5 ppm STEL | 1 ppm (ST) 5 ppm See Section 5201 |
Ca See Appendix A |
2 ppm | |
Butanethiol; see Butyl mercaptan | ||||||
2-Butanone (Methyl ethyl ketone) | 78-93-3 | 200 | 590 | 200 ppm (ST) 300 ppm |
200 ppm (ST) 300 ppm |
200 ppm (ST) 300 ppm |
2-Butoxyethanol | 111-76-2 | 50 | 240 | 20 ppm | 5 ppm | 20 ppm |
n-Butyl-acetate | 123-86-4 | 150 | 710 | 150 ppm (ST) 200 ppm |
150 ppm (ST) 200 ppm |
(n) |
sec-Butyl acetate | 105-46-4 | 200 | 950 | 200 ppm | 200 ppm | (n) |
tert-Butyl-acetate | 540-88-5 | 200 | 950 | 200 ppm | 200 ppm | (n) |
n-Butyl alcohol | 71-36-3 | 100 | 300 | (C) 50 ppm | (C) 50 ppm | 20 ppm |
sec-Butyl alcohol | 78-92-2 | 150 | 450 | 100 ppm | 100 ppm (ST) 150 ppm |
100 ppm |
tert-Butyl alcohol | 75-65-0 | 100 | 300 | 100 ppm (ST) 150 ppm |
100 ppm (ST) 150 ppm |
100 ppm |
Butylamine | 109-73-9 | (C) 5 | (C) 15 | (C) 5 ppm | (C) 5 ppm | (C) 5 ppm |
tert-Butyl chromate (as CrO3)(m); see 1910.1026 | 1189-85-1 | (C) 0.1 mg/m3 | Ca 0.001 mg/m3 CR (VI) See Appendix A See Appendix C |
(C) 0.1 mg/m3 | ||
n-Butyl glycidyl ether (BGE) | 2426-08-6 | 50 | 270 | 25 ppm | (C) 5.6 ppm [15-min] | 3 ppm |
Butyl mercaptan | 109-79-5 | 10 | 35 | 0.5 ppm | (C) 0.5 ppm [15-min] | 0.5 ppm |
p-tert-Butyltoluene | 98-51-1 | 10 | 60 | 1 ppm (ST) 20 ppm |
10 ppm (ST) 20 ppm |
1 ppm |
Cadmium (as Cd); see 1910.1027 | 7440-43-9 | 0.005 mg/m3 see Sections 1532 & 5207 |
Ca See Appendix A |
0.01 mg/m3 (total) 0.002 mg/m3 (resp.) |
||
Calcium Carbonate | 1317-65-3 | see PNOR | ||||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | |||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
Calcium hydroxide | 1305-62-0 | |||||
Total dust | 15 | 5 mg/m3 | 5 mg/m3 | 5 mg/m3 | ||
Respirable fraction | 5 | |||||
Calcium oxide | 1305-78-8 | 5 | 2 mg/m3 | 2 mg/m3 | 2 mg/m3 | |
Calcium silicate | 1344-95-2 | see PNOR | 1 mg/m3, natural as Wollastonite (IHL, no asbestos and < 1% crystalline silica) | |||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | |||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
Calcium sulfate | 7778-18-9 | see PNOR | 10 mg/m3 (IHL) | |||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | |||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
Camphor, synthetic | 76-22-2 | 2 | 2 mg/m3 | 2 mg/m3 | 2 ppm (ST) 3 ppm |
|
Carbaryl (Sevin) | 63-25-2 | 5 | 5 mg/m3 | 5 mg/m3 | 0.5 mg/m3 (IFV) | |
Carbon black | 1333-86-4 | 3.5 | 3.5 mg/m3 | 3.5 mg/m3 (without PAHs); when PAHs are present, NIOSH considers carbon black to be a potential occupational carcinogen. See Appendix A, See Appendix C |
3 mg/m3 (IHL) | |
Carbon dioxide | 124-38-9 | 5000 | 9000 | 5000 ppm (ST) 30,000 ppm |
5000 ppm (ST) 30,000 ppm |
5000 ppm (ST) 30,000 ppm |
Carbon disulfide | 75-15-0 | See Annotated Z-2 | See Annotated Z-2 | |||
Carbon monoxide | 630-08-0 | 50 | 55 | 25 ppm (C) 200 ppm |
35 ppm (C) 200 ppm |
25 ppm |
Carbon tetrachloride | 56-23-5 | See Annotated Z-2 | See Annotated Z-2 | |||
Cellulose | 9004-34-6 | see PNOR | ||||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | 10 mg/m3 | ||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
Chlordane | 57-74-9 | 0.5 | 0.5 mg/m3 | Ca 0.5 mg/m3 See Appendix A |
0.5 mg/m3 (IFV) | |
Chlorinated camphene | 8001-35-2 | 0.5 | 0.5 mg/m3 (ST) 1 mg/m3 |
Ca See Appendix A |
0.5 mg/m3 (ST) 1 mg/m3 |
|
Chlorinated diphenyl oxide | 55720-99-5 | 0.5 | 0.5 mg/m3 | 0.5 mg/m3 | 0.5 mg/m3 (ortho isomer) | |
Chlorine | 7782-50-5 | (C) 1 | (C) 3 | 0.5 ppm (ST) 1 ppm |
(C) 0.5 ppm [15-min] | 0.1 ppm (ST) 0.4 ppm |
Chlorine dioxide | 10049-04-4 | 0.1 | 0.3 | 0.1 ppm (ST) 0.3 ppm |
0.1 ppm (ST) 0.3 ppm |
(C) 0.1 ppm |
Chlorine trifluoride | 7790-91-2 | (C) 0.1 | (C) 0.4 | (C) 0.1 ppm | (C) 0.1 ppm | (C) 0.1 ppm |
Chloroacetaldehyde | 107-20-0 | (C) 1 | (C) 3 | (C) 1 ppm | (C) 1 ppm | (C) 1 ppm |
a-Chloroacetophenone (Phenacyl chloride) | 532-27-4 | 0.05 | 0.3 | 0.05 ppm | 0.05 ppm | 0.05 ppm |
Chlorobenzene | 108-90-7 | 75 | 350 | 10 ppm | See Appendix D | 10 ppm |
o-Chlorobenzylidene malononitrile | 2698-41-1 | 0.05 | 0.4 | (C) 0.05 ppm | (C) 0.05 ppm | (C) 0.05 ppm (IFV) |
Chlorobromomethane | 74-97-5 | 200 | 1050 | 200 ppm | 200 ppm | 200 ppm |
2-Chloro-1,3-butadiene; See beta-Chloroprene | ||||||
Chlorodiphenyl (42% Chlorine) (PCB) | 53469-21-9 | 1 | 1 mg/m3 | Ca 0.001 mg/m3 See Appendix A |
1 mg/m3 | |
Chlorodiphenyl (54% Chlorine) (PCB) | 11097-69-1 | 0.5 | 0.5 mg/m3 | Ca 0.001 mg/m3 See Appendix A |
0.5 mg/m3 | |
1-Chloro-2,3-epoxypropane; See Epichlorohydrin | ||||||
2-Chloroethanol; See Ethylene chlorohydrin | ||||||
Chloroethylene; see Vinyl chloride | ||||||
Chloroform (Trichloromethane) | 67-66-3 | (C) 50 | (C) 240 | 2 ppm | Ca (ST) 2 ppm [60-min] See Appendix A |
10 ppm |
bis(Chloromethyl) ether; see 1910.1008 | 542-88-1 | 0.001 ppm See Section 5209 |
Ca See Appendix A |
0.001 ppm | ||
Chloromethyl methyl ether see 1910.1006 |
107-30-2 | See Section 5209 | Ca See Appendix A |
Exposure by all routes should be carefully controlled to levels as low as possible. | ||
1-Chloro-1-nitropropane | 600-25-9 | 20 | 100 | 2 ppm | 2 ppm | 2 ppm |
Chloropicrin | 76-06-2 | 0.1 | 0.7 | 0.1 ppm | 0.1 ppm | 0.1 ppm |
beta-Chloroprene | 126-99-8 | 25 | 90 | 10 ppm | Ca (C) 1 ppm [15-min] See Appendix A |
1 ppm |
2-Chloro-6-(trichloromethyl)pyridine | 1929-82-4 | 10 mg/m3 (IFV) (ST) 20 mg/m3 (IFV) |
||||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 (ST) 20 mg/m3 |
|||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
Chromium (II) compounds (as Cr) | 7440-47-3 | 0.5 | 0.5 mg/m3 | 0.5 mg/m3 See Appendix C |
||
Chromium (III) compounds (as Cr) | 7440-47-3 | 0.5 | 0.5 mg/m3 | 0.5 mg/m3 See Appendix C |
0.003 mg/m3-(IHL), water soluble |
|
Chromium (VI) compounds See 1910.1026(k) | 0.005 mg/m3 as Cr (C) 0.1 mg/m3 See Sections 1532.2, 5206, and 8359 |
Ca |
0.0002 mg/m3 (IHL) (ST) 0.0005 mg/m3(IHL), water soluble (includes chromic acid and chromates) |
|||
Chromium metal and insol. salts (as Cr) | 7440-47-3 | 1 | 0.5 mg/m3 | 0.5 mg/m3 See Appendix C |
0.5 mg/m3(IHL)(metallic chromium) | |
Chrysene; see Coal tarpitch volatiles | Exposure by all routes should be carefully controlled to levels as low as possible. | |||||
Clopidol | 2971-90-6 | 3 mg/m3 (IFV) | ||||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 (ST) 20 mg/m3 |
|||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
Coal dust (less than 5% SiO2, respirable fraction) | See Annotated Z-3 | See Annotated Z-3 | ||||
Coal dust (greater than or equal to 5% SiO2 respirable fraction) | See Annotated Z-3 | See Annotated Z-3 | ||||
Coal tar pitch volatiles (benzene soluble fraction), anthracene, BaP, phenanthrene, acridine, chrysene, pyrene) | 65966-93-2 | 0.2 | 0.2 mg/m3 | Ca 0.1 mg/m3 (cyclohexane-extractable fraction) See Appendix A See Appendix C |
0.2 mg/m3(as benzene soluble aerosol) | |
Cobalt metal, dust, and fume (as Co) | 7440-48-4 | 0.1 | 0.02 mg/m3 | 0.05 mg/m3 | 0.02 mg/m3 (IHL) | |
Coke oven emissions; see 1910.1029 | 0.15 mg/m3 See Section 5211 |
Ca 0.2 mg/m3(benzene-soluble fraction) See Appendix A See Appendix C |
||||
Copper | 7440-50-8 | |||||
Fume (as Cu) | 0.1 | 0.1 mg/m3 | 0.1 mg/m3 | 0.2 mg/m3 | ||
Dusts and mists (as Cu) | 1 | 1 mg/m3 | 1 mg/m3 | 1 mg/m3 | ||
Cotton dust(l), see 1910.1043 | 1 | 1 mg/m3 (in waste processing) See Section 5190 |
< 0.200 mg/m3 See Appendix C |
0.1 mg/m3 (Thor.) (raw untreated) | ||
Crag herbicide (Sesone) | 136-78-7 | |||||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | 10 mg/m3 | ||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
Cresol, all isomers | 1319-77-3 | 5 | 22 | 5 ppm | 2.3 ppm | 20 mg/m3 (IFV) |
Crotonaldehyde | 123-73-9 / 4170-30-3 |
2 | 6 | (C) 0.3 ppm | 2 ppm See Appendix C (Aldehydes) |
(C) 0.3 ppm |
Cumene | 98-82-8 | 50 | 245 | 50 ppm | 50 ppm | 50 ppm |
Cyanides (as CN) | Varies with compound | 5 | 5 mg/m3 | (C) 5 mg/m3 [10-min] | (C) 5 mg/m3, salts | |
Cyclohexane | 110-82-7 | 300 | 1050 | 300 ppm | 300 ppm | 100 ppm |
Cyclohexanol | 108-93-0 | 50 | 200 | 50 ppm | 50 ppm | 50 ppm |
Cyclohexanone | 108-94-1 | 50 | 200 | 25 ppm | 25 ppm | 20 ppm (ST) 50 ppm |
Cyclohexene | 110-83-8 | 300 | 1015 | 300 ppm | 300 ppm | 300 ppm |
Cyclopentadiene | 542-92-7 | 75 | 200 | 75 ppm | 75 ppm | (q) |
2,4-D (Dichlorophen-oxyacetic acid) | 94-75-7 | 10 | 10 mg/m3 | 10 mg/m3 | 10 mg/m3 (IHL) | |
Decaborane | 17702-41-9 | 0.05 | 0.3 | 0.05 ppm (ST) 0.15 ppm |
0.05 ppm (ST) 0.15 ppm |
0.05 ppm (ST) 0.15 ppm |
Demeton (Systox) | 8065-48-3 | 0.1 | 0.1 mg/m3 | 0.1 mg/m3 | 0.05 mg/m3 (IFV) | |
Diacetone alcohol (4-Hydroxy-4-methyl-2-pentanone) | 123-42-2 | 50 | 240 | 50 ppm | 50 ppm | 50 ppm |
1,2-Diaminoethane; see Ethylenediamine | ||||||
Diazomethane | 334-88-3 | 0.2 | 0.4 | 0.2 ppm | 0.2 ppm | 0.2 ppm |
Diborane | 19287-45-7 | 0.1 | 0.1 | 0.1 ppm | 0.1 ppm | 0.1 ppm |
1,2-Dibromo-3-chloropropane (DBCP); see 1910.1044 | 96-12-8 | 0.001 ppm See Section 5212 |
Ca See Appendix A |
|||
1,2-Dibromoethane; see Ethylene dibromide | ||||||
Dibutyl phosphate | 107-66-4 | 1 | 5 | 1 ppm (ST) 2 ppm |
1 ppm (ST) 2 ppm |
5 mg/m3 (IFV) |
Dibutyl phthalate | 84-74-2 | 5 | 5 mg/m3 | 5 mg/m3 | 5 mg/m3 | |
o-Dichlorobenzene | 95-50-1 | (C) 50 | (C) 300 | 25 ppm (C) 50 ppm |
(C) 50 ppm | 25 ppm (C) 50 ppm |
p-Dichlorobenzene | 106-46-7 | 75 | 450 | 10 ppm (ST) 110 ppm (C) 200 ppm |
Ca See Appendix A |
10 ppm |
3,3'-Dichlorobenzidine; see 1910.1007 |
91-94-1 | See Section 5209 | Ca See Appendix A |
Exposure by all routes should be carefully controlled to levels as low as possible. | ||
Dichlorodifluoromethane | 75-71-8 | 1000 | 4950 | 1000 ppm (C) 6200 ppm |
1000 ppm | 1000 ppm |
1,3-Dichloro-5,5-dimethyl hydantoin | 118-52-5 | 0.2 | 0.2 mg/m3 (ST) 0.4 mg/m3 |
0.2 mg/m3 (ST) 0.4 mg/m3 |
0.2 mg/m3 (ST) 0.4 mg/m3 |
|
Dichlorodiphenyltrichloroethane (DDT) | 50-29-3 | 1 | 1 mg/m3 | Ca 0.5 mg/m3 See Appendix A |
1 mg/m3 | |
1,1-Dichloroethane | 75-34-3 | 100 | 400 | 100 ppm | 100 ppm See Appendix C (Chloroethanes) |
100 ppm |
1,2-Dichloroethane; see Ethylene dichloride | ||||||
1,2-Dichloroethylene | 540-59-0 | 200 | 790 | 200 ppm | 200 ppm | 200 ppm |
Dichloroethyl ether | 111-44-4 | (C) 15 | (C) 90 | 5 ppm (ST) 10 ppm |
Ca 5 ppm (ST) 10 ppm See Appendix A |
5 ppm (ST) 10 ppm |
Dichloromethane; see Methylene chloride | ||||||
Dichloromonofluoromethane | 75-43-4 | 1000 | 4200 | 10 ppm | 10 ppm | 10 ppm |
1,1-Dichloro-1-nitroethane | 594-72-9 | (C) 10 | (C) 60 | 2 ppm | 2 ppm | 2 ppm |
1,2-Dichloropropane; see Propylene dichloride | ||||||
Dichlorotetrafluoroethane | 76-14-2 | 1000 | 7000 | 1000 ppm | 1000 ppm | 1000 ppm |
Dichlorvos (DDVP) | 62-73-7 | 1 | 1 mg/m3 | 1 mg/m3 | 0.1 mg/m3 (IFV) | |
Dicyclopentadienyl iron | 102-54-5 | |||||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | 10 mg/m3 as Fe | ||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
Dieldrin | 60-57-1 | 0.25 | 0.25 mg/m3 | Ca 0.25 mg/m3 See Appendix A |
0.1 mg/m3 (IFV) | |
Diethylamine | 109-89-7 | 25 | 75 | (C) 5 ppm | 10 ppm (ST) 25 ppm |
5 ppm (ST) 15 ppm |
2-Diethylaminoethanol | 100-37-8 | 10 | 50 | 2 ppm | 10 ppm | 2 ppm |
Diethyl ether; see Ethyl ether | ||||||
Difluorodibromomethane | 75-61-6 | 100 | 860 | 100 ppm | 100 ppm | 100 ppm |
Diglycidyl ether (DGE) | 2238-07-5 | (C) 0.5 | (C) 2.8 | 0.1 ppm | Ca 0.1 ppm See Appendix A |
0.01 ppm |
Dihydroxybenzene; see Hydroquinone | ||||||
Diisobutyl ketone | 108-83-8 | 50 | 290 | 25 ppm | 25 ppm | 25 ppm |
Diisopropylamine | 108-18-9 | 5 | 20 | 5 ppm | 5 ppm | 5 ppm |
4-Dimethylaminoazo-benzene; see 1910.1015 | 60-11-7 | See Section 5209 | Ca See Appendix A |
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Dimethoxymethane; see Methylal | ||||||
Dimethyl acetamide | 127-19-5 | 10 | 35 | 10 ppm | 10 ppm | 10 ppm |
Dimethylamine | 124-40-3 | 10 | 18 | 5 ppm (ST) 15 ppm |
10 ppm | 5 ppm (ST) 15 ppm |
Dimethylaminobenzene; see Xylidine | ||||||
Dimethylaniline (N,N-Dimethylaniline) | 121-69-7 | 5 | 25 | 5 ppm (ST) 10 ppm |
5 ppm (ST) 10 ppm |
5 ppm (ST) 10 ppm |
Dimethylbenzene; see Xylene | ||||||
Dimethyl-1,2-dibromo-2,2-dichloroethylphosphate | 300-76-5 | 3 | 3 mg/m3 | 3 mg/m3 | 0.1 mg/m3 (IFV) | |
Dimethylformamide | 68-12-2 | 10 | 30 | 10 ppm | 10 ppm | 5 ppm |
2,6-Dimethyl-4-heptanone; see Diisobutyl ketone | ||||||
1,1-Dimethylhydrazine | 57-14-7 | 0.5 | 1 | 0.01 ppm | Ca (C) 0.06 ppm [2-hr] See Appendix A |
0.01 ppm |
Dimethylphthalate | 131-11-3 | 5 | 5 mg/m3 | 5 mg/m3 | 5 mg/m3 | |
Dimethyl sulfate | 77-78-1 | 1 | 5 | 0.1 ppm | Ca 0.1 ppm See Appendix A |
0.1 ppm |
Dinitrobenzene (all isomers) | 1 | 0.15 ppm | 1 mg/m3 | 0.15 ppm (IFV) | ||
(ortho) | 528-29-0 | |||||
(meta) | 99-65-0 | |||||
(para) | 100-25-4 | |||||
Dinitro-o-cresol | 534-52-1 | 0.2 | 0.2 mg/m3 | 0.2 mg/m3 | 0.2 mg/m3 (IFV) | |
Dinitrotoluene | 25321-14-6 | 1.5 | 0.15 mg/m3 | Ca 1.5 mg/m3 See Appendix A |
0.2 mg/m3 | |
Dioxane (Diethylene dioxide) | 123-91-1 | 100 | 360 | 0.28 ppm | Ca (C) 1 ppm [30-min] See Appendix A |
20 ppm |
Diphenyl (Biphenyl) | 92-52-4 | 0.2 | 1 | 0.2 ppm | 0.2 ppm | 0.2 ppm |
Diphenylmethane diisocyanate; see Methylene bisphenylisocyanate | ||||||
Dipropylene glycol methyl ether | 34590-94-8 | 100 | 600 | 100 ppm (ST) 150 ppm |
100 ppm (ST) 150 ppm |
100 ppm (ST) 150 ppm |
Di-sec octyl phthalate (Di-(2-ethylhexyl) phthalate) | 117-81-7 | 5 | 5 mg/m3 | Ca 5 mg/m3 (ST) 10 mg/m3 See Appendix A |
5 mg/m3 | |
Emery | 12415-34-8 | see PNOR | See Appendix D | See TLV® for Aluminum metal and insoluble compounds | ||
Total dust | 15 | 10 mg/m3 | ||||
Respirable fraction | 5 | 5 mg/m3 | ||||
Endrin | 72-20-8 | 0.1 | 0.1 mg/m3 | 0.1 mg/m3 | 0.1 mg/m3 | |
Epichlorohydrin | 106-89-8 | 5 | 19 | 0.05 ppm | Ca See Appendix A |
0.5 ppm |
EPN | 2104-64-5 | 0.5 | 0.1 mg/m3 | 0.5 mg/m3 | 0.1 mg/m3 (IFV) | |
1,2-Epoxypropane; see Propylene oxide | ||||||
2,3-Epoxy-1-propanol; see Glycidol | ||||||
Ethanethiol; see Ethyl mercaptan | ||||||
Ethanolamine | 141-43-5 | 3 | 6 | 3 ppm (ST) 6 ppm |
3 ppm (ST) 6 ppm |
3 ppm (ST) 6 ppm |
2-Ethoxyethanol (Cellosolve) | 110-80-5 | 200 | 740 | 5 ppm | 0.5 ppm | 5 ppm |
2-Ethoxyethyl acetate (Cellosolve acetate) | 111-15-9 | 100 | 540 | 5 ppm | 0.5 ppm | 5 ppm |
Ethyl acetate | 141-78-6 | 400 | 1400 | 400 ppm | 400 ppm | 400 ppm |
Ethyl acrylate | 140-88-5 | 25 | 100 | 5 ppm (ST) 25 ppm |
Ca See Appendix A |
5 ppm (ST) 15 ppm |
Ethyl alcohol (Ethanol) | 64-17-5 | 1000 | 1900 | 1000 ppm | 1000 ppm | (ST) 1000 ppm |
Ethylamine | 75-04-7 | 10 | 18 | (C) 5 ppm | 10 ppm | 5 ppm (ST) 15 ppm |
Ethyl amyl ketone (5-Methyl-3-heptanone) | 541-85-5 | 25 | 130 | 25 ppm | 25 ppm | 10 ppm |
Ethyl benzene | 100-41-4 | 100 | 435 | 5 ppm (ST) 30 ppm |
100 ppm (ST) 125 ppm |
20 ppm |
Ethyl bromide | 74-96-4 | 200 | 890 | 5 ppm | See Appendix D | 5 ppm |
Ethyl butyl ketone (3-Heptanone) | 106-35-4 | 50 | 230 | 50 ppm (ST) 75 ppm |
50 ppm | 50 ppm (ST) 75 ppm |
Ethyl chloride | 75-00-3 | 1000 | 2600 | 100 ppm | See Appendix C (Chloroethanes) | 100 ppm |
Ethyl ether | 60-29-7 | 400 | 1200 | 400 ppm (ST) 500 ppm |
See Appendix D | 400 ppm (ST) 500 ppm |
Ethyl formate | 109-94-4 | 100 | 300 | 100 ppm | 100 ppm | (ST) 100 ppm |
Ethyl mercaptan | 75-08-1 | (C) 10 | (C) 25 | 0.5 ppm | (C) 0.5 ppm [15-min] | 0.5 ppm |
Ethyl silicate | 78-10-4 | 100 | 850 | 10 ppm | 10 ppm | 10 ppm |
Ethylene chlorohydrin | 107-07-3 | 5 | 16 | (C) 1 ppm | (C) 1 ppm | (C) 1 ppm |
Ethylenediamine | 107-15-3 | 10 | 25 | 10 ppm | 10 ppm | 10 ppm |
Ethylene dibromide | 106-93-4 | See Annotated Z-2 | See Annotated Z-2 | |||
Ethylene dichloride (1,2-Dichloroethane) | 107-06-2 | See Annotated Z-2 | See Annotated Z-2 | |||
Ethylene glycol dinitrate | 628-96-6 | (C) 0.2 | (C) 1 | 0.05 ppm for exposures to mixture of ethylene glycol dinitrate and nitroglycerin (ST) 0.1 mg/m3 |
(ST) 0.1 mg/m3 | 0.05 ppm |
Ethylene glycol methylacetate; see Methylcellosolve acetate | ||||||
Ethyleneimine; see 1910.1012 | 151-56-4 | 0.5 ppm See Section 5209 |
Ca See Appendix A |
0.05 ppm (ST) 0.1 ppm |
||
Ethylene oxide; see 1910.1047 | 75-21-8 | 1 ppm (ST) 5 ppm See Section 5220 |
Ca < 0.1 ppm (C) 5 ppm [10-min/day] See Appendix A |
1 ppm | ||
Ethylidene chloride; see 1,1-Dichlorethane | ||||||
N-Ethylmorpholine | 100-74-3 | 20 | 94 | 5 ppm | 5 ppm | 5 ppm |
Ferbam | 14484-64-1 | |||||
Total dust | ........ | 15 | 10 mg/m3 | 10 mg/m3 | 5 mg/m3 (IHL) | |
Ferrovanadium dust | 12604-58-9 | ........ | 1 | 1 mg/m3 (ST) 3 mg/m3 |
1 mg/m3 (ST) 3 mg/m3 |
1 mg/m3 (ST) 3 mg/m3 |
Fluorides (as F) | Varies with compound | ........ | 2.5 | 2.5 mg/m3 | 2.5 mg/m3 | 2.5 mg/m3 |
Fluorine | 7782-41-4 | 0.1 | 0.2 | 0.1 ppm | 0.1 ppm | 0.1 ppm (C) 0.5 ppm |
Fluorotrichloromethane (Trichlorofluoromethane) | 75-69-4 | 1000 | 5600 | (C) 1000 ppm | (C) 1000 ppm | (C) 1000 ppm |
Formaldehyde; see 1910.1048 | 50-00-0 | 0.75 ppm (ST) 2 ppm See Section 5217 |
Ca 0.016 ppm (C) 0.1 ppm [15-min] See Appendix A |
0.1 ppm (ST) 0.3 ppm |
||
Formic acid | 64-18-6 | 5 | 9 | 5 ppm (ST) 10 ppm |
5 ppm | 5 ppm (ST) 10 ppm |
Furfural | 98-01-1 | 5 | 20 | 2 ppm | See Appendix D | 0.2 ppm |
Furfuryl alcohol | 98-00-0 | 50 | 200 | 10 ppm (ST) 15 ppm |
10 ppm (ST) 15 ppm |
0.2 ppm |
Grain dust (oat, wheat barley) | 10 | 10 mg/m3 | 4 mg/m3 | 4 mg/m3 | ||
Glycerin (mist) | 56-81-5 | PNOR | See Appendix D | |||
Total dust | 15 | 10 mg/m3 | ||||
Respirable fraction | 5 | 5 mg/m3 | ||||
Glycidol | 556-52-5 | 50 | 150 | 2 ppm | 25 ppm | 2 ppm |
Glycol monoethyl ether; see 2-Ethoxyethanol | ||||||
Graphite, natural respirable dust | 7782-42-5 | See Annotated Z-3 | See Annotated Z-3 | |||
Graphite, synthetic | ||||||
Total dust | 15 | 10 mg/m3 | See Appendix D | |||
Respirable Fraction | 5 | 5 mg/m3 | 2 mg/m3 (all forms except fibers) | |||
Guthion; see Azinphos methyl | ||||||
Gypsum | 13397-24-5 | PNOR | See calcium sulfate | |||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | |||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
Hafnium | 7440-58-6 | 0.5 | 0.5 mg/m3 | 0.5 mg/m3 | 0.5 mg/m3 | |
Heptachlor | 76-44-8 | 0.5 | 0.05 mg/m3 | Ca 0.5 mg/m3 See Appendix A |
0.05 mg/m3 | |
Heptane (n-Heptane) | 142-82-5 | 500 | 2000 | 400 ppm (ST) 500 ppm |
85 ppm (ST) 440 ppm [15-min] |
400 ppm (ST) 500 ppm |
Hexachloroethane | 67-72-1 | 1 | 10 | 1 ppm | Ca 1 ppm See Appendix A See Appendix C (Chloroethanes) |
1 ppm |
Hexachloronaphthalene | 1335-87-1 | 0.2 | 0.2 mg/m3 | 0.2 mg/m3 | 0.2 mg/m3 | |
n-Hexane | 110-54-3 | 500 | 1800 | 50 ppm | 50 ppm | 50 ppm |
2-Hexanone (Methyl n-butyl ketone) | 591-78-6 | 100 | 410 | 1 ppm (ST) 10 ppm |
1 ppm | 5 ppm (ST) 10 ppm |
Hexone (Methyl isobutyl ketone) | 108-10-1 | 100 | 410 | 50 ppm (ST) 75 ppm |
50 ppm (ST) 75 ppm |
20 ppm (ST) 75 ppm |
sec-Hexyl acetate | 108-84-9 | 50 | 300 | 50 ppm | 50 ppm | 50 ppm |
Hydrazine | 302-01-2 | 1 | 1.3 | 0.01 ppm | Ca (C) 0.03 ppm [2-hr] See Appendix A |
0.01 ppm |
Hydrogen bromide | 10035-10-6 | 3 | 10 | (C) 3 ppm | (C) 3 ppm | (C) 2 ppm |
Hydrogen chloride | 7647-01-0 | (C) 5 | (C) 7 | 0.3 ppm (C) 2 ppm |
(C) 5 ppm | (C) 2 ppm |
Hydrogen cyanide | 74-90-8 | 10 | 11 | (C) 4.7 ppm | (ST) 4.7 ppm | (C) 4.7 ppm |
Hydrogen fluoride (as F) | 7664-39-3 | See Annotated Z-2 | See Annotated Z-2 | |||
Hydrogen peroxide | 7722-84-1 | 1 | 1.4 | 1 ppm | 1 ppm | 1 ppm |
Hydrogen selenide (as Se) | 7783-07-5 | 0.05 | 0.2 | 0.05 ppm | 0.05 ppm | 0.05 ppm |
Hydrogen sulfide | 7783-06-4 | See Annotated Z-2 | See Annotated Z-2 | |||
Hydroquinone | 123-31-9 | ........ | 2 | 2 mg/m3 | (C) 2 mg/m3 [15-min] | 1 mg/m3 |
Iodine | 7553-56-2 | (C) 0.1 | (C) 1 | (C) 0.1 ppm | (C) 0.1 ppm | 0.01 ppm (IFV) (ST) 0.1 ppm (V) |
Iron oxide | 1309-37-1 | 10 (fume) | 5 mg/m3 (fume) | 5 mg/m3 (dust and fume) | 5 mg/m3 (resp.) | |
Isoamyl acetate | 123-92-2 | 100 | 525 | 50 ppm (ST) 100 ppm |
100 ppm | 50 ppm (ST) 100 ppm |
Isoamyl alcohol (primary and secondary) | 123-51-3 | 100 | 360 | 100 ppm (ST) 125 ppm |
100 ppm (ST) 125 ppm |
100 ppm (ST) 125 ppm |
Isobutyl acetate | 110-19-0 | 150 | 700 | 150 ppm | 150 ppm | (n) |
Isobutyl alcohol | 78-83-1 | 100 | 300 | 50 ppm | 50 ppm | 50 ppm |
Isophorone | 78-59-1 | 25 | 140 | 4 ppm | 4 ppm | (C) 5 ppm |
Isopropyl acetate | 108-21-4 | 250 | 950 | 250 ppm (ST) 310 ppm |
See Appendix D | (p) |
Isopropyl alcohol | 67-63-0 | 400 | 980 | 400 ppm (ST) 500 ppm |
400 ppm (ST) 500 ppm |
200 ppm (ST) 400 ppm |
Isopropylamine | 75-31-0 | 5 | 12 | 5 ppm (ST) 10 ppm |
See Appendix D | 5 ppm (ST) 10 ppm |
Isopropyl ether | 108-20-3 | 500 | 2100 | 250 ppm | 500 ppm | 250 ppm (ST) 310 ppm |
Isopropyl glycidyl ether (IGE) | 4016-14-2 | 50 | 240 | 50 ppm (ST) 75 ppm |
(C) 50 ppm [15-min] | 50 ppm (ST) 75 ppm |
Kaolin | 1332-58-7 | |||||
Total dust | 15 | 10 mg/m3 | ||||
Respirable fraction | 5 | 2 mg/m3 (no asbestos, < 1% crystalline silica) |
5 mg/m3 | 2 mg/m3 (no asbestos and < 1% crystalline silica) | ||
Ketene | 463-51-4 | 0.5 | 0.9 | 0.5 ppm (ST) 1.5 ppm |
0.5 ppm (ST) 1.5 ppm |
0.5 ppm (ST) 1.5 ppm |
Lead inorganic (as Pb); see 1910.1025 |
7439-92-1 | 0.05 mg/m3 See Section 5198 |
0.05 mg/m3 See Appendix C |
0.05 mg/m3 | ||
Limestone | 1317-65-3 | see PNOR | See calcium carbonate | |||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | |||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
Lindane | 58-89-9 | 0.5 | 0.5 mg/m3 | 0.5 mg/m3 | 0.5 mg/m3 | |
Lithium hydride | 7580-67-8 | 0.025 | 0.025 mg/m3 | 0.025 mg/m3 | (C) 0.05 mg/m3 (IHL) | |
L.P.G. (Liquified petroleum gas) | 68476-85-7 | 1000 | 1800 | 1000 ppm | 1000 ppm | See TLV® book Appendix F (D, EX) |
Magnesite | 546-93-0 | See PNOR | ||||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | |||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
Magnesium oxide fume - Total Particulate | 1309-48-4 | 15 | 10 mg/m3 | See Appendix D | 10 mg/m3 (IHL) | |
Malathion - Total dust | 121-75-5 | 15 | 10 mg/m3 | 10 mg/m3 | 1 mg/m3 (IFV) | |
Maleic anhydride | 108-31-6 | 0.25 | 1 | 0.1 ppm | 1 mg/m3 | 0.01 mg/m3 (IFV) |
Manganese compounds (as Mn) | 7439-96-5 | (C) 5 | 0.2 mg/m3 | 1 mg/m3 (ST) 3 mg/m3 |
0.02 mg/m3 (resp.) 0.1 mg/m3 (IHL) (for elemental and inorganic compounds) |
|
Manganese fume (as Mn) | 7439-96-5 | (C) 5 | 0.2 mg/m3 | 1 mg/m3 (ST) 3 mg/m3 |
0.02 mg/m3 (resp.) 0.1 mg/m3 (IHL) (for elemental and inorganic compounds) |
|
Marble | 1317-65-3 | See PNOR | ||||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | |||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
Mercury (aryl and inorganic) (as Hg) | 7439-97-6 | See Annotated Z-2 | See Annotated Z-2 | |||
Mercury (organo) alkylcompounds (as Hg) | 7439-97-6 | See Annotated Z-2 | See Annotated Z-2 | |||
Mercury (vapor) (as Hg) | 7439-97-6 | See Annotated Z-2 | See Annotated Z-2 | |||
Mesityl oxide | 141-79-7 | 25 | 100 | 15 ppm (ST) 25 ppm |
10 ppm | 15 ppm (ST) 25 ppm |
Methanethiol; see Methyl mercaptan | ||||||
Methoxychlor - Total dust | 72-43-5 | 15 | 10 mg/m3 | Ca See Appendix A |
10 mg/m3 | |
2-Methoxyethanol; (Methyl cellosolve) | 109-86-4 | 25 | 80 | 5 ppm | 0.1 ppm | 0.1 ppm |
2-Methoxyethyl acetate (Methyl cellosolve acetate) | 110-49-6 | 25 | 120 | 5 ppm | 0.1 ppm | 0.1 ppm |
Methyl acetate | 79-20-9 | 200 | 610 | 200 ppm (ST) 250 ppm |
200 ppm (ST) 250 ppm |
200 ppm (ST) 250 ppm |
Methyl acetylene (Propyne) | 74-99-7 | 1000 | 1650 | 1000 ppm | 1000 ppm | 1000 ppm (EX) |
Methyl acetylene propadiene mixture (MAPP) | 1000 | 1800 | 1000 ppm (ST) 1250 ppm |
1000 ppm (ST) 1250 ppm |
1000 ppm (EX) (ST) 1250 ppm (EX) |
|
Methyl acrylate | 96-33-3 | 10 | 35 | 10 ppm | 10 ppm | 2 ppm |
Methylal (Dimethoxy-methane) | 109-87-5 | 1000 | 3100 | 1000 ppm | 1000 ppm | 1000 ppm |
Methyl alcohol | 67-56-1 | 200 | 260 | 200 ppm (ST) 250 ppm (C) 1000 ppm |
200 ppm (ST) 250 ppm |
200 ppm (ST) 250 ppm |
Methylamine | 74-89-5 | 10 | 12 | 5 ppm (ST) 15 ppm |
10 ppm | 5 ppm (ST) 15 ppm |
Methyl amyl alcohol; see Methyl Isobutylcarbinol | ||||||
Methyl n-amyl ketone | 110-43-0 | 100 | 465 | 50 ppm | 100 ppm | 50 ppm |
Methyl bromide | 74-83-9 | (C) 20 | (C) 80 | 1 ppm (ST) 20 ppm |
Ca See Appendix A |
1 ppm |
Methyl butyl ketone; see 2-Hexanone | ||||||
Methyl cellosolve; see 2-Methoxyethanol | ||||||
Methyl cellosolve acetate; see 2-Methoxyethylacetate | ||||||
Methyl chloride | 74-87-3 | See Annotated Z-2 | See Annotated Z-2 | |||
Methyl chloroform (1,1,1-Trichloro-ethane) | 71-55-6 | 350 | 1900 | 350 ppm (ST) 450 ppm (C) 800 ppm |
(C) 350 ppm [15-min] See Appendix C (Chloroethanes) |
350 ppm (ST) 450 ppm |
Methylcyclohexane | 108-87-2 | 500 | 2000 | 400 ppm | 400 ppm | 400 ppm |
Methylcyclohexanol | 25639-42-3 | 100 | 470 | 50 ppm | 50 ppm | 50 ppm |
o-Methylcyclohexanone | 583-60-8 | 100 | 460 | 50 ppm (ST) 75 ppm |
50 ppm (ST) 75 ppm |
50 ppm (ST) 75 ppm |
Methylene chloride | 75-09-2 | See Annotated Z-2 | See Annotated Z-2 | |||
Methyl ethyl ketone (MEK); see 2-Butanone | ||||||
Methyl formate | 107-31-3 | 100 | 250 | 100 ppm (ST) 150 ppm |
100 ppm (ST) 150 ppm |
50 ppm (ST) 100 ppm |
Methyl hydrazine (Monomethylhydrazine) | 60-34-4 | (C) 0.2 | (C) 0.35 | 0.01 ppm | Ca (C) 0.04 ppm [2-hr] See Appendix A |
0.01 ppm |
Methyl iodide | 74-88-4 | 5 | 28 | 2 ppm | Ca 2 ppm See Appendix A |
2 ppm |
Methyl isoamyl ketone | 110-12-3 | 100 | 475 | 50 ppm | 50 ppm | 20 ppm (ST) 50 ppm |
Methyl isobutyl carbinol | 108-11-2 | 25 | 100 | 25 ppm (ST) 40 ppm |
25 ppm (ST) 40 ppm |
25 ppm (ST) 40 ppm |
Methyl isobutyl ketone; see Hexone | ||||||
Methyl isocyanate | 624-83-9 | 0.02 | 0.05 | 0.02 ppm | 0.02 ppm | 0.02 ppm (ST) 0.06 ppm |
Methyl mercaptan | 74-93-1 | (C) 10 | (C) 20 | 0.5 ppm | (C) 0.5 ppm [15-min] | 0.5 ppm |
Methyl methacrylate | 80-62-6 | 100 | 410 | 50 ppm (ST) 100 ppm |
100 ppm | 50 ppm (ST) 100 ppm |
Methyl propyl ketone; see 2-Pentanone | ||||||
alpha-Methyl styrene | 98-83-9 | (C) 100 | (C) 480 | 50 ppm (ST) 100 ppm |
50 ppm (ST) 100 ppm |
10 ppm |
Methylene bisphenyl isocyanate (MDI) | 101-68-8 | (C) 0.02 | (C) 0.2 | 0.005 ppm | 0.05 mg/m3 (C) 0.2 mg/m3 [10-min] |
0.005 ppm |
Mica; see Silicates | See Annotated Z-3 | See Annotated Z-3 | ||||
Molybdenum (as Mo) | 7439-98-7 | |||||
Soluble compounds | 5 | 0.5 mg/m3 | See Appendix D | 0.5 mg/m3 (resp.) | ||
Insoluble Compounds - Total dust | 15 | 10 mg/m3 | See Appendix D | |||
Insoluble Compounds | 3 mg/m3 (resp.) | 10 mg/m3 (IHL) 3 mg/m3 (resp.) |
||||
Monomethyl aniline | 100-61-8 | 2 | 9 | 0.5 ppm | 0.5 ppm | 0.5 ppm |
Monomethyl hydrazine; see Methyl hydrazine | ||||||
Morpholine | 110-91-8 | 20 | 70 | 20 ppm (ST) 30 ppm |
20 ppm (ST) 30 ppm |
20 ppm |
Naphtha (Coal tar) | 8030-30-6 | 100 | 400 | 100 ppm | 100 ppm | See TLV® book Appendix H |
Naphthalene | 91-20-3 | 10 | 50 | 0.1 ppm | 10 ppm (ST) 15 ppm |
10 ppm |
alpha-Naphthylamine; see 1910.1004 | 134-32-7 | See Section 5209 | Ca See Appendix A |
|||
beta-Naphthylamine; see 1910.1009 | 91-59-8 | See Section 5209 | Ca See Appendix A |
Exposure by all routes should be carefully controlled to levels as low as possible. | ||
Nickel carbonyl (as Ni) | 13463-39-3 | 0.001 | 0.007 | 0.001 ppm | Ca 0.001 ppm See Appendix A |
(C) 0.05 ppm |
Nickel, metal and insoluble compounds (as Ni) | 7440-02-0 | 1 | metal 0.5 mg/m3 insoluble 0.1 mg/m3 |
Ca 0.015 mg/m3 See Appendix A |
elemental: 1.5 mg/m3 (IHL); insoluble inorganic compounds: 0.2 mg/m3 (IHL) | |
Nickel, soluble compounds (as Ni) | 7440-02-0 | 1 | 0.05 mg/m3 | Ca 0.015 mg/m3 |
soluble inorganic compounds: 0.1 mg/m3 (IHL) | |
Nicotine | 54-11-5 | 0.5 | 0.075 ppm | 0.5 mg/m3 | 0.5 mg/m3 | |
Nitric acid | 7697-37-2 | 2 | 5 | 2 ppm (ST) 4 ppm |
2 ppm (ST) 4 ppm |
2 ppm (ST) 4 ppm |
Nitric oxide | 10102-43-9 | 25 | 30 | 25 ppm | 25 ppm | 25 ppm |
p-Nitroaniline | 100-01-6 | 1 | 6 | 3 mg/m3 | 3 mg/m3 | 3 mg/m3 |
Nitrobenzene | 98-95-3 | 1 | 5 | 1 ppm | 1 ppm | 1 ppm |
p-Nitrochlorobenzene | 100-00-5 | 1 | 0.1 ppm | Ca See Appendix A |
0.1 ppm | |
4-Nitrodiphenyl; see 1910.1003 | 92-93-3 | See Section 5209 | Ca See Appendix A |
Exposure by all routes should be carefully controlled to levels as low as possible. | ||
Nitroethane | 79-24-3 | 100 | 310 | 100 ppm | 100 ppm | 100 ppm |
Nitrogen dioxide | 10102-44-0 | (C) 5 | (C) 9 | (ST) 1 ppm | (ST) 1 ppm | 0.2 ppm |
Nitrogen trifluoride | 7783-54-2 | 10 | 29 | 10 ppm | 10 ppm | 10 ppm |
Nitroglycerin | 55-63-0 | (C) 0.2 | (C) 2 | 0.05 ppm for mixture of nitroglycerine and ethylene glycol dinitrate (ST) 0.1 mg/m3 |
(ST) 0.1 mg/m3 | 0.05 ppm |
Nitromethane | 75-52-5 | 100 | 250 | 2 ppm | See Appendix D | 20 ppm |
1-Nitropropane | 108-03-2 | 25 | 90 | 25 ppm | 25 ppm | 25 ppm |
2-Nitropropane | 79-46-9 | 25 | 90 | 10 ppm | Ca See Appendix A |
10 ppm |
N-Nitrosodimethylamine; see 1910.1016 | See Section 5209 | Ca See Appendix A |
Exposure by all routes should be carefully controlled to levels as low as possible. | |||
Nitrotoluene (all isomers) | 5 | 30 | 2 ppm | 2 ppm | 2 ppm | |
o-isomer | 88-72-2 | |||||
m-isomer | 99-08-1 | |||||
p-isomer | 99-99-0 | |||||
Nitrotrichloromethane; see Chloropicrin | ||||||
Octachloronaphthalene | 2234-13-1 | 0.1 | 0.1 mg/m3 (ST) 0.3 mg/m3 |
0.1 mg/m3 (ST) 0.3 mg/m3 |
0.1 mg/m3 (ST) 0.3 mg/m3 |
|
Octane | 111-65-9 | 500 | 2350 | 300 ppm (ST) 375 ppm |
75 ppm (C) 385 ppm [15-min] |
300 ppm |
Oil mist, mineral | 8012-95-1 | 5 | 5 mg/m3 (excluding vapor) | 5 mg/m3 (ST) 10 mg/m3 |
5 mg/m3 (IHL; excluding metal working fluids, pure highly and severely refined) (For poorly and mildly refined: exposure by all routes should be carefully controlled to levels as low as possible.) |
|
Osmium tetroxide (as Os) | 20816-12-0 | 0.002 | 0.002 mg/m3 (ST) 0.006 mg/m3 |
0.002 mg/m3 (ST) 0.006 mg/m3 |
0.0016 mg/m3 (ST) 0.0047 mg/m3 |
|
Oxalic acid | 144-62-7 | 1 | 1 mg/m3 (ST) 2 mg/m3 |
1 mg/m3 (ST) 2 mg/m3 |
1 mg/m3 (ST) 2 mg/m3 |
|
Oxygen difluoride | 7783-41-7 | 0.05 | 0.1 | (C) 0.05 ppm | (C) 0.05 ppm | (C) 0.05 ppm |
Ozone | 10028-15-6 | 0.1 | 0.2 | 0.1 ppm (ST) 0.3 ppm |
(C) 0.1 ppm | 0.05-0.20 ppm depending on workload and time (See TLV® Documentation on Ozone) |
Paraquat, respirable dust | 4685-14-7 | 0.5 | 0.05 mg/m3(IHL), as the cation | |||
1910-42-5 | 0.1 mg/m3 | 0.1 mg/m3 | ||||
2074-50-2 | ||||||
Parathion | 56-38-2 | 0.1 | 0.1 mg/m3 | 0.05 mg/m3 | 0.05 mg/m3 (IFV) | |
Particulates Not Otherwise Regulated (PNOR)(i) | See Appendix D | See TLV® book Appendix B | ||||
Total dust | 15 | 10 mg/m3 | ||||
Respirable fraction | 5 | 5 mg/m3 | ||||
PCB; see Chlorodiphenyl (42% and 54% chlorine) | ||||||
Pentaborane | 19624-22-7 | 0.005 | 0.01 | 0.005 ppm (ST) 0.015 ppm |
0.005 ppm (ST) 0.015 ppm |
0.005 ppm (ST) 0.015 ppm |
Pentachloronaphthalene | 1321-64-8 | 0.5 | 0.5 mg/m3 | 0.5 mg/m3 | 0.5 mg/m3 (IFV) | |
Pentachlorophenol | 87-86-5 | 0.5 | 0.5 mg/m3 | 0.5 mg/m3 | 0.5 mg/m3 (ST) 1 mg/m3 |
|
Pentaerythritol | 115-77-5 | See PNOR | ||||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | 10 mg/m3 | ||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
Pentane | 109-66-0 | 1000 | 2950 | 600 ppm | 120 ppm (C) 610 ppm [15-min] |
1000 ppm |
2-Pentanone (Methylpropyl ketone) | 107-87-9 | 200 | 700 | 200 ppm (ST) 250 ppm |
150 ppm | (ST) 150 ppm |
Perchloroethylene (Tetrachloroethylene) | 127-18-4 | See Annotated Z-2 | See Annotated Z-2 | |||
Perchloromethyl mercaptan | 594-42-3 | 0.1 | 0.8 | 0.1 ppm | 0.1 ppm | 0.1 ppm |
Perchloryl fluoride | 7616-94-6 | 3 | 13.5 | 3 ppm (ST) 6 ppm |
3 ppm (ST) 6 ppm |
3 ppm (ST) 6 ppm |
Petroleum distillates (Naphtha) (Rubber Solvent) | 500 | 2000 | 1600 mg/m3 | 350 mg/m3 (C) 1800 mg/m3 [15-min] |
See TLV® book Appendix H | |
Phenol | 108-95-2 | 5 | 19 | 5 ppm | 5 ppm (C) 15.6 ppm [15-min] |
5 ppm |
p-Phenylene diamine | 106-50-3 | 0.1 | 0.1 mg/m3 | 0.1 mg/m3 | 0.1 mg/m3 | |
Phenyl ether, vapor | 101-84-8 | 1 | 7 | 1 ppm | 1 ppm | 1 ppm (ST) 2 ppm |
Phenyl ether-biphenyl mixture, vapor | 1 | 7 | 1 ppm | |||
Phenylethylene; see Styrene | ||||||
Phenyl glycidyl ether (PGE) | 122-60-1 | 10 | 60 | 0.1 ppm | Ca (C) 1 ppm [15-min] See Appendix A |
0.1 ppm |
Phenylhydrazine | 100-63-0 | 5 | 22 | 5 ppm (ST) 10 ppm |
Ca (C) 0.14 ppm [2-hr] See Appendix A |
0.1 ppm |
Phosdrin (Mevinphos) | 7786-34-7 | 0.1 | 0.01 ppm (ST) 0.03 ppm |
0.01 ppm (ST) 0.03 ppm |
0.01 mg/m3 (IFV) | |
Phosgene (Carbonyl chloride) | 75-44-5 | 0.1 | 0.4 | 0.1 ppm | 0.1 ppm (C) 0.2 ppm [15-min] |
0.1 ppm |
Phosphine | 7803-51-2 | 0.3 | 0.4 | 0.3 ppm (ST) 1 ppm |
0.3 ppm (ST) 1 ppm |
0.05 ppm (C) 0.15 ppm |
Phosphoric acid | 7664-38-2 | 1 | 1 mg/m3 (ST) 3 mg/m3 |
1 mg/m3 (ST) 3 mg/m3 |
1 mg/m3 (ST) 3 mg/m3 |
|
Phosphorus (yellow) | 7723-14-0 | 0.1 | 0.1 mg/m3 | 0.1 mg/m3 | 0.1 mg/m3 | |
Phosphorus pentachloride | 10026-13-8 | 1 | 0.1 ppm | 1 mg/m3 | 0.1 ppm | |
Phosphorus pentasulfide | 1314-80-3 | 1 | 1 mg/m3 (ST) 3 mg/m3 |
1 mg/m3 (ST) 3 mg/m3 |
1 mg/m3 (ST) 3 mg/m3 |
|
Phosphorus trichloride | 7719-12-2 | 0.5 | 3 | 0.2 ppm (ST) 0.5 ppm |
0.2 ppm (ST) 0.5 ppm |
0.2 ppm (ST) 0.5 ppm |
Phthalic anhydride | 85-44-9 | 2 | 12 | 1 ppm | 6 mg/m3 | 0.002 mg/m3 (IFV) (ST) 0.005 mg/m3 (IFV) |
Picloram | 1918-0-21 | |||||
Total dust | 15 | 10 mg/m3 | See Appendix D | 10 mg/m3 | ||
Respirable fraction | 5 | 5 mg/m3 | ||||
Picric acid | 88-89-1 | 0.1 | 0.1 mg/m3 | 0.1 mg/m3 (ST) 0.3 mg/m3 |
0.1 mg/m3 | |
Pindone (2-Pivalyl-1,3-indandione) | 83-26-1 | 0.1 | 0.1 mg/m3 | 0.1 mg/m3 | 0.1 mg/m3 | |
Plaster of paris | 26499-65-0 | See PNOR | See TLV® for calcium sulfate | |||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | |||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
Platinum (as Pt) Metal | 7440-06-4 | 1 mg/m3 | 1 mg/m3 | 1 mg/m3 | ||
Soluble Salts | 0.002 | 0.002 mg/m3 | 0.002 mg/m3 | 0.002 mg/m3 | ||
Portland cement | 65997-15-1 | See PNOR | ||||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | |||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | 1 mg/m3 (no asbestos and < 1% crystalline silica) | ||
Propane | 74-98-6 | 1000 | 1800 | 1000 ppm | 1000 ppm | See TLV® book Appendix F (D, EX) |
beta-Propriolactone; see 1910.1013 | 57-57-8 | 0.5 ppm See Section 5209 |
Ca See Appendix A |
0.5 ppm | ||
n-Propyl acetate | 109-60-4 | 200 | 840 | 200 ppm (ST) 250 ppm |
200 ppm (ST) 250 ppm |
(p) |
n-Propyl alcohol | 71-23-8 | 200 | 500 | 200 ppm (ST) 250 ppm |
200 ppm (ST) 250 ppm |
100 ppm |
n-Propyl nitrate | 627-13-4 | 25 | 110 | 25 ppm (ST) 40 ppm |
25 ppm (ST) 40 ppm |
25 ppm (ST) 40 ppm |
Propylene dichloride | 78-87-5 | 75 | 350 | 75 ppm (ST) 110 ppm |
Ca See Appendix A |
10 ppm |
Propylene imine | 75-55-8 | 2 | 5 | 2 ppm | Ca 2 ppm See Appendix A |
0.2 ppm (ST) 0.4 ppm |
Propylene oxide | 75-56-9 | 100 | 240 | 2 ppm | Ca See Appendix A |
2 ppm |
Propyne; see Methylacetylene | ||||||
Pyrethrum | 8003-34-7 | 5 | 5 mg/m3 | 5 mg/m3 | 5 mg/m3 | |
Pyridine | 110-86-1 | 5 | 15 | 5 ppm | 5 ppm | 1 ppm |
Quinone | 106-51-4 | 0.1 | 0.4 | 0.1 ppm | 0.4 mg/m3 | 0.1 ppm |
RDX: see Cyclonite | ||||||
Rhodium (as Rh), metal fume and insoluble compounds | 7440-16-6 | 0.1 | 0.1 mg/m3 | 0.1 mg/m3 | 1 mg/m3 | |
Rhodium (as Rh), soluble compounds | 7440-16-6 | 0.001 | 0.001 mg/m3 | 0.001 mg/m3 | 0.01 mg/m3 | |
Ronnel | 299-84-3 | 15 | 10 mg/m3 | 10 mg/m3 | 5 mg/m3 (IFV) | |
Rotenone | 83-79-4 | 5 | 5 mg/m3 | 5 mg/m3 | 5 mg/m3 | |
Rouge | See PNOR | See Appendix D | See iron oxide | |||
Total dust | 15 | 10 mg/m3 | ||||
Respirable fraction | 5 | 5 mg/m3 | ||||
Selenium compounds (as Se) | 7782-49-2 | 0.2 | 0.2 mg/m3 | 0.2 mg/m3 | 0.2 mg/m3 | |
Selenium hexafluoride (as Se) | 7783-79-1 | 0.05 | 0.4 | 0.05 ppm | 0.05 ppm | 0.05 ppm |
Silica, amorphous, precipitated and gel | 112926-00-8 | See Annotated Z-3 | See Annotated Z-3 | |||
Silica, amorphous, diatomaceous earth, containing less than 1% crystalline silica | 61790-53-2 | See Annotated Z-3 | See Annotated Z-3 | |||
Silica, crystalline, respirable dust | ||||||
Cristobalite; see 1910.1053(m) | 14464-46-1 |
0.05 mg/m3
|
Ca 0.05 mg/m3 See Appendix A |
0.025 mg/m3 (resp.) for α-quartz and cristobalite | ||
Quartz: see 1910.1053(m) | 14808-60-7 | 0.05 mg/m3 (See Sections 1532.3 & 5204) |
Ca 0.05 mg/m3 See Appendix A |
0.025 mg/m3 (resp.) for α-quartz and cristobalite | ||
Tripoli (as quartz); see 1910.1053(m) | 1317-95-9 | 0.05 mg/m3 (See Sections 1532.3 & 5204) |
Ca |
0.025 mg/m3 (resp.) for α-quartz and cristobalite | ||
Tridymite; see 1910.1053(m) | 15468-32-3 | 0.05 mg/m3 (See Sections 1532.3 & 5204) |
Ca |
|||
Silica, fused, respirable dust | 60676-86-0 | See Annotated Z-3 | See Annotated Z-3 | |||
Silicates (less than 1% crystalline silica) | ||||||
Mica (respirable dust) | 12001-26-2 | See Annotated Z-3 | See Annotated Z-3 | |||
Soapstone, total dust | See Annotated Z-3 | See Annotated Z-3 | ||||
Soapstone, respirable dust | See Annotated Z-3 | See Annotated Z-3 | ||||
Talc (containing asbestos): use asbestos limit: see 29 CFR 1910.1001 | See Annotated Z-3 | See Annotated Z-3 | ||||
Talc (containing no asbestos), respirable dust | 14807-96-6 | See Annotated Z-3 | See Annotated Z-3 | |||
Tremolite, asbestiform; see 1910.1001 | See Annotated Z-3 | See Annotated Z-3 | ||||
Silicon | 7440-21-3 | See PNOR | ||||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | |||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
Silicon carbide | 409-21-2 | See PNOR | Fibrous (including whiskers) 0.1 f/cc Nonfibrous: 10 mg/m3 (IHL) (no asbestos and < 1% crystalline silica) |
|||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | |||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | 3 mg/m3 (resp., no asbestos and < 1% crystalline silica) | ||
Silver, metal and soluble compounds (as Ag) | 7440-22-4 | 0.01 | 0.01 mg/m3 | 0.01 mg/m3 | Metal, dust, and fume: 0.1 mg/m3; Soluble compounds, as Ag: 0.01 mg/m3 |
|
Soapstone | See Annotated Z-3 | See Annotated Z-3 | ||||
Sodium fluoroacetate | 62-74-8 | 0.05 | 0.05 mg/m3 (ST) 0.15 mg/m3 |
0.05 mg/m3 (ST) 0.15 mg/m3 |
0.05 mg/m3 | |
Sodium hydroxide | 1310-73-2 | 2 | (C) 2 mg/m3 | (C) 2 mg/m3 | (C) 2 mg/m3 | |
Starch | 9005-25-8 | See PNOR | ||||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | 10 mg/m3 | ||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
Stibine | 7803-52-3 | 0.1 | 0.5 | 0.1 ppm | 0.1 ppm | 0.1 ppm |
Stoddard solvent | 8052-41-3 | 500 | 2900 | 100 ppm | 350 mg/m3 (C) 1800 mg/m3 [15-min] |
100 ppm |
Strychnine | 57-24-9 | 0.15 | 0.15 mg/m3 | 0.15 mg/m3 | 0.15 mg/m3 | |
Styrene | 100-42-5 | See Annotated Z-2 | See Annotated Z-2 | |||
Sucrose | 57-50-1 | See PNOR | ||||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | 10 mg/m3 | ||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
Sulfur dioxide | 7446-09-5 | 5 | 13 | 2 ppm (ST) 5 ppm |
2 ppm (ST) 5 ppm |
(ST) 0.25 ppm |
Sulfur hexafluoride | 2551-62-4 | 1000 | 6000 | 1000 ppm | 1000 ppm | 1000 ppm |
Sulfuric acid | 7664-93-9 | 1 | 0.1 mg/m3 (ST) 3 mg/m3 |
1 mg/m3 | 0.2 mg/m3 (Thor.) |
|
Sulfur monochloride | 10025-67-9 | 1 | 6 | (C) 1 ppm | (C) 1 ppm | (C) 1 ppm |
Sulfur pentafluoride | 5714-22-7 | 0.025 | 0.25 | (C) 0.01 ppm | (C) 0.01 ppm | (C) 0.01 ppm |
Sulfuryl fluoride | 2699-79-8 | 5 | 20 | 5 ppm (ST) 10 ppm |
5 ppm (ST) 10 ppm |
5 ppm (ST) 10 ppm |
Systox; see Demeton | ||||||
2,4,5-T (2,4,5-tri-chlorophenoxyacetic acid) | 93-76-5 | 10 | 10 mg/m3 | 10 mg/m3 | 10 mg/m3 | |
Talc; see Silicates | See Annotated Z-3 | See Annotated Z-3 | ||||
Tantalum, metal and oxide dust | 7440-25-7 | 5 | 5 mg/m3 | 5 mg/m3 (ST) 10 mg/m3 |
See TLV® book Appendix G | |
TEDP (Sulfotep) | 3689-24-5 | 0.2 | 0.2 mg/m3 | 0.2 mg/m3 | 0.1 mg/m3 (IFV) | |
Tellurium and compounds (as Te) | 13494-80-9 | 0.1 | 0.1 mg/m3 | 0.1 mg/m3 | 0.1 mg/m3 (excluding hydrogen telluride) |
|
Tellurium hexafluoride (as Te) | 7783-80-4 | 0.02 | 0.2 | 0.02 ppm | 0.02 ppm | 0.02 ppm |
Temephos | 3383-96-8 | 1 mg/m3 (IHL) | ||||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | |||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
TEPP (Tetraethyl pyrophosphate) | 107-49-3 | 0.05 | 0.004 ppm | 0.05 mg/m3 | 0.01 mg/m3 (IFV) | |
Terphenyls | 26140-60-3 | (C) 1 | (C) 9 | (C) 0.5 ppm | (C) 0.5 ppm | (C) 5 mg/m3 |
1,1,1,2-Tetrachloro-2,2-difluoroethane | 76-11-9 | 500 | 4170 | 500 ppm | 500 ppm | 100 ppm |
1,1,2,2-Tetrachloro-1,2-difluoroethane | 76-12-0 | 500 | 4170 | 500 ppm | 500 ppm | 50 ppm |
1,1,2,2-Tetrachloroethane | 79-34-5 | 5 | 35 | 1 ppm | Ca 1 ppm See Appendix A See Appendix C (Chloroethanes) |
1 ppm |
Tetrachoroethylene; see Perchloroethylene | ||||||
Tetrachloromethane; see Carbon tetrachloride | ||||||
Tetrachloronaphthalene | 1335-88-2 | 2 | 2 mg/m3 | 2 mg/m3 | 2 mg/m3 | |
Tetraethyl lead (as Pb) | 78-00-2 | 0.075 | 0.075 mg/m3 | 0.075 mg/m3 | 0.1 mg/m3 | |
Tetrahydrofuran | 109-99-9 | 200 | 590 | 200 ppm (ST) 250 ppm |
200 ppm (ST) 250 ppm |
50 ppm (ST) 100 ppm |
Tetramethyl lead, (as Pb) | 75-74-1 | 0.075 | 0.075 mg/m3 | 0.075 mg/m3 | 0.15 mg/m3 | |
Tetramethyl succinonitrile | 3333-52-6 | 0.5 | 3 | 0.5 ppm | 3 mg/m3 | 0.5 mg/m3 (IFV) |
Tetranitromethane | 509-14-8 | 1 | 8 | 0.005 ppm | 1 ppm | 0.005 ppm |
Tetryl (2,4,6-Trinitrophenylmethylnitramine) | 479-45-8 | 1.5 | 1.5 mg/m3 | 1.5 mg/m3 | 1.5 mg/m3 | |
Thallium, soluble compounds (as Tl) | 7440-28-0 | 0.1 | 0.1 mg/m3 | 0.1 mg/m3 | 0.02 mg/m3 (IHL) | |
4,4'-Thiobis (6-tert,Butyl-m-cresol) | 96-69-5 | 1 mg/m3 (IHL) | ||||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | |||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
Thiram | 137-26-8 | 5 | 5 mg/m3 | 5 mg/m3 | 0.05 mg/m3 (IFV) | |
Tin, inorganic compounds (except oxides) (as Sn) | 7440-31-5 | 2 | 2 mg/m3; also tin oxide; except SnH4 | 2 mg/m3; except tin oxides | metal, oxide and inorganic compounds, except tin hydride and indium tin oxide, as Sn: 2 mg/m3 (IHL) | |
Tin, organic compounds (as Sn) | 7440-31-5 | 0.1 | 0.1 mg/m3 (ST) 0.2 mg/m3 |
0.1 mg/m3 except Cyhexatin | 0.1 mg/m3 (ST) 0.2 mg/m3 |
|
Titanium dioxide - Total dust | 13463-67-7 | 15 | See PNOR | Ca (ultrafine particles) 2.4 mg/m3 (fine) 0.3 mg/m3 (ultrafine) See Appendix A See NIOSH Intelligence Bulletin 63 |
10 mg/m3 | |
Toluene | 108-88-3 | See Annotated Z-2 | See Annotated Z-2 | |||
Toluene-2,4-diisocyanate (TDI) | 584-84-9 | (C) 0.02 | (C) 0.14 | 0.005 ppm (ST) 0.02 ppm (C) 0.02 ppm |
Ca See Appendix A |
0.001 ppm (IFV) |
o-Toluidine | 95-53-4 | 5 | 22 | 2 ppm | Ca See Appendix A |
2 ppm |
Toxaphene; see Chlorinated camphene | ||||||
Tremolite | See Annotated Z-3 | See Annotated Z-3 | ||||
Tributyl phosphate | 126-73-8 | 5 | 0.2 ppm | 0.2 ppm | 5 mg/m3 (IFV) | |
1,1,1-Trichloroethane; see Methyl chloroform | ||||||
1,1,2-Trichloroethane | 79-00-5 | 10 | 45 | 10 ppm | Ca 10 ppm See Appendix A See Appendix C (Chloroethanes) |
10 ppm |
Trichloroethylene | 79-01-6 | See Annotated Z-2 | See Annotated Z-2 | |||
Trichloromethane; see Chloroform | ||||||
Trichloronaphthalene | 1321-65-9 | 5 | 5 mg/m3 | 5 mg/m3 | 5 mg/m3 | |
1,2,3-Trichloropropane | 96-18-4 | 50 | 300 | 10 ppm | Ca 10 ppm See Appendix A |
0.005 ppm |
1,1,2-Trichloro-1,2,2-trifluoroethane | 76-13-1 | 1000 | 7600 | 1000 ppm (ST) 1250 ppm (C) 2000 ppm |
1000 ppm (ST) 1250 ppm |
1000 ppm (ST) 1250 ppm |
Triethylamine | 121-44-8 | 25 | 100 | (C) 1 ppm | See Appendix D | 0.5 ppm (ST) 1 ppm |
Trifluorobromomethane | 75-63-8 | 1000 | 6100 | 1000 ppm | 1000 ppm | 1000 ppm |
2,4,6-Trinitrophenol;see Picric acid | ||||||
2,4,6-Trinitrophenyl-methyl nitramine; see Tetryl | ||||||
2,4,6-Trinitrotoluene (TNT) | 118-96-7 | 1.5 | 0.5 mg/m3 | 0.5 mg/m3 | 0.1 mg/m3 (IFV) | |
Triorthocresyl phosphate | 78-30-8 | 0.1 | 0.1 mg/m3 | 0.1 mg/m3 | 0.02 mg/m3 (IFV) | |
Triphenyl phosphate | 115-86-6 | 3 | 3 mg/m3 | 3 mg/m3 | 3 mg/m3 | |
Turpentine | 8006-64-2 | 100 | 560 | 100 ppm | 100 ppm | 20 ppm |
Uranium (as U) | 7440-61-1 | |||||
Soluble compounds | 0.05 | 0.05 mg/m3 | Ca 0.05 mg/m3, See Appendix A |
0.2 mg/m3 (ST) 0.6 mg/m3 |
||
Insoluble compounds | 0.25 | 0.2 mg/m3 (ST) 0.6 mg/m3 |
Ca 0.2 mg/m3 (ST) 0.6 mg/m3 See Appendix A |
0.2 mg/m3 (ST) 0.6 mg/m3 |
||
Vanadium | 1314-62-1 | 0.05 mg/m3 (IHL) Vanadium pentoxide as V |
||||
Respirable dust (as V2O5) | (C) 0.5 | 0.05 mg/m3, vanadium pentoxide | (C) 0.05 mg V/m3 [15-min], except Vanadium metal and Vanadium carbide |
|||
Fume (as V2O5) | (C) 0.1 | 0.05 mg/m3 | (C) 0.05 mg V/m3 [15-min] | |||
Vegetable oil mist | Vegetable oil mists (except castor, cashew nut or similar irritant oils) See PNOR |
|||||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | |||
Respirable fraction | 5 | 5 mg/m3 | 5 mg/m3 | |||
Vinyl benzene; see Styrene | ||||||
Vinyl chloride; see 1910.1017 | 75-01-4 | 1 ppm See Section 5210 |
Ca See Appendix A |
1 ppm | ||
Vinyl cyanide; see Acrylonitrile | ||||||
Vinyl toluene | 25013-15-4 | 100 | 480 | 50 ppm | 100 ppm | 50 ppm (ST) 100 ppm |
Warfarin | 81-81-2 | 0.1 | 0.1 mg/m3 | 0.1 mg/m3 | 0.01 mg/m3 (IHL) | |
Xylenes (o-, m-, p-isomers) | 1330-20-7 | 100 | 435 | 100 ppm (ST) 150 ppm (C) 300 ppm |
100 ppm (ST) 150 ppm |
100 ppm (ST) 150 ppm |
Xylidine | 1300-73-8 | 5 | 25 | 0.5 ppm | 2 ppm | 0.5 ppm (IFV) |
Yttrium | 7440-65-5 | 1 | 1 mg/m3 | 1 mg/m3 | 1 mg/m3 | |
Zinc chloride fume | 7646-85-7 | 1 | 1 mg/m3 (ST) 2 mg/m3 |
1 mg/m3 (ST) 2 mg/m3 |
1 mg/m3 (ST) 2 mg/m3 |
|
Zinc oxide fume | 1314-13-2 | 5 | 5 mg/m3 (ST) 10 mg/m3 |
5 mg/m3 (ST) 10 mg/m3 |
2 mg/m3 (resp.) (ST) 10 mg/m3 (resp) |
|
Zinc oxide | 1314-13-2 | See PNOR | ||||
Total dust | 15 | 10 mg/m3 | 5 mg/m3 (C) 15 mg/m3 |
|||
Respirable fraction | 5 | 5 mg/m3 | 2 mg/m3 (ST) 10 mg/m3 |
|||
Zinc stearate | 557-05-1 | See TLV® Documentation on Stearates | ||||
Total dust | 15 | 10 mg/m3 | 10 mg/m3 | 10 mg/m3 (IHL) | ||
Respirable fraction | 5 | 5 mg/m3 | 3 mg/m3(resp.) | |||
Zirconium compounds (as Zr) | 7440-67-7 | 5 | 5 mg/m3 (ST) 10 mg/m3 |
5 mg/m3 (ST) 10 mg/m3 |
5 mg/m3 (ST) 10 mg/m3 |
Annotated Z-1 Table Footnotes, Abbreviations, References
(a) The unshaded area on this page lists PELs from OSHA Table Z-1 in 29 CFR 1910.1000. The shaded area of this page lists other occupational exposure limits (OELs) from Cal/OSHA, NIOSH, and ACGIH®.
(b) Occupational Safety and Health Administration (OSHA) Permissible Exposure Limits (PELS) from 29 CFR 1910.1000 Z-1 Table [58 FR 35340, June 30, 1993; 58 FR 40191, July 27, 1993, as amended at 61 FR 56831, Nov. 4, 1996; 62 FR 1600, Jan 10,1997; 62 FR 42018, Aug. 4,1997; 71 FR 10373, Feb. 28, 2006; 71 FR 16673, Apr. 3, 2006; 71 FR 36008, June 23, 2006.]. [OSHA entries for respirable crystalline silica from 81 FR 16285, March 25, 2016; OSHA entries for beryllium and beryllium compounds from 82 FR 2470, January 9, 2017]. PELs are 8-hour time weighted averages (TWAs) unless otherwise indicated. OSHA enforces these limits under section 5(a)(2) of the OSH Act. In addition to the values listed in this table, the Z tables in 29 CFR 1910.1000 list skin absorption designations.
(c) The CAS number is for information only. Enforcement is based on the substance name. For an entry covering more than one metal compound measured as the metal, the CAS number for the metal is given - not CAS numbers for the individual compounds.
(d) Parts of vapor or gas per million parts of contaminated air by volume at 25 degrees C and 760 torr.
(e) Milligrams of substance per cubic meter of air. When entry is in this column only, the value is exact; when listed with a ppm entry, it is approximate.
(f) California Division of Occupational Safety and Health (Cal/OSHA) Permissible Exposure Limits (PELs) from Table AC-1 last viewed October 2, 2019, viewable at http://www.dir.ca.gov/title8/5155table_ac1.html. Cal/OSHA enforces its PELs in workplaces under its jurisdiction. Cal/OSHA has established occupational exposure limits for compounds not included in the OSHA Z Tables. Please see Cal/OSHA Table AC-1 for additional limits, the most current limits, and other designations such as skin absorption. The Cal/OSHA AC-1 table and regulations should be consulted for explanations.
(g) National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limits (RELs) from the NIOSH Pocket Guide to Chemical Hazards (https://www.cdc.gov/niosh/npg) (Web site last accessed on October 18, 2019). RELs are for up to 10-hour time weighted averages (TWAs) during a 40-hour work week unless otherwise indicated. NIOSH has established occupational exposure limits for compounds not included in the OSHA Z Tables. Please see the NIOSH Pocket Guide for additional limits, skin absorption and other designations, and explanations.
(h) ACGIH® Threshold Limit Values (TLVs®) (ACGIH® 2019). TLVs® are listed in the order of 8-hour time weighted averages (TWAs), STELs (ST), and Ceilings (C), if available. ACGIH® has established TLVs® for compounds not included in the OSHA Z Tables. Please see ACGIH® Documentation for additional limits, skin absorption and other designations, and explanations. The 2019 TLV® and BEI® Book and Documentation of the Threshold Limit Values on Chemical Substances, 7th Edition are available through the ACGIH® website at http://www.acgih.org. The TLVs® and BEIs® are copyrighted by ACGIH® and are not publicly available. Permission must be requested from ACGIH® to reproduce the TLVs® and BEIs®. Click here for permission request form.
(i) In 29 CFR 1000, all inert or nuisance dusts, whether mineral, inorganic, or organic, not listed specifically by substance name are covered by the Particulates Not Otherwise Regulated (PNOR) limit which is the same as the inert or nuisance dust limit of Table Z-3.
(j) The final benzene standard in 1910.1028 applies to all occupational exposures to benzene except in some circumstances the distribution and sale of fuels, sealed containers and pipelines, coke production, oil and gas drilling and production, natural gas processing, and the percentage exclusion for liquid mixtures; for the excepted subsegments, the benzene limits in Table Z-2 apply. See 1910.1028 for specific circumstances.
(k) See Table Z-2 for the exposure limits for any operations or sectors where the exposure limits in 1910.1026 are stayed or are otherwise not in effect.
(l) This 8-hour TWA applies to respirable dust as measured by a vertical elutriator cotton dust sampler or equivalent instrument. The time-weighted average applies to the cotton waste processing operations of waste recycling (sorting, blending, cleaning and willowing) and garnetting. See also 1910.1043 for cotton dust limits applicable to other sectors.
(m) See Table Z-3 for the exposure limit for any operations or sectors where the exposure limit in § 1910.1053 is stayed or is otherwise not in effect.
(n) For butyl acetate all isomers [105-46-4; 110-19-0; 123-86-4; 540-88-5]: TWA = 50 ppm; STEL = 150 ppm.
(o) See Table Z–2 for the exposure limits for any operations or sectors where the exposure limits in § 1910.1024 are stayed or otherwise not in effect.
(p) For propyl acetate isomers (108-21-4; 109-60-4): TWA = 100 ppm; STEL = 150 ppm.
(q) For dicyclopentadiene (77-73-6), including cyclopentadiene: TWA = 0.5 ppm; STEL = 1 ppm
Abbreviations
- C = Ceiling limit
- Ca = Potential occupational carcinogens
- CAS No. = Chemical Abstract Service Number
- D = Simple asphyxiant
- EX = Explosion hazard: the substance is a flammable asphyxiant or excursions about the TLV® could approach 10% of the lower explosive limit
- f/cm3 = fibers/cubic centimeter
- f/cc = fibers/cubic centimeter
- hr = hour
- IHL = Inhalable
- IFV = Inhalable Fraction and Vapor
- m3 = cubic meters
- min = Minute
- mg/m3 = milligrams/meter cubed
- PAH = Polycyclic aromatic hydrocarbons
- PNOR = Particulates not otherwise regulated
- ppm = parts per million
- resp. = respirable
- ST = Short Term Exposure Limit
- Thor. = Thoracic fraction
- TLV® = Threshold Limit Value
- TWA – Time weighted average
- V = Vapor and aerosol
References
ACGIH® 2019 Threshold Limit Values for Chemical Substances in the Work Environment. Adopted by ACGIH® with Intended Changes. See http://www.acgih.org/.
California Division of Occupational Safety and Health (Cal/OSHA) Table AC-1, Permissible Exposure Limits (PELs), in California Code of Regulations (CCR) Title 8 Section 5155, last viewed October 2, 2019. Viewable at http://www.dir.ca.gov/title8/5155table_ac1.html.
National Institute for Occupational Safety and Health (NIOSH) (2019) NIOSH Pocket Guide to Chemical Hazards. Department of Health and Human Services. Centers for Disease Control and Prevention. National Institute for Occupational Safety and Health (NIOSH). Web site last accessed on October 18, 2019. Available at https://www.cdc.gov/niosh/npg
Occupational Safety and Health Administration (OSHA) (2017) Air Contaminants. 29 CFR 1910.1000 [82 FR 2735, January 9, 2017]. Web site accessed on April 4, 2018. Available at https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000