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Particulates Not Otherwise Regulated (Respirable Fraction)

General Description

Synonyms: Dust (respirable nuisance); "Inert" dusts; Nuisance dusts; PNOR (Note: includes all inert or nuisance dusts, whether mineral, inorganic, not listed specifically in 1910.1000)

OSHA IMIS code: 9130 (IMIS History: Dust [respirable nuisance] prior to 9/1/89)

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method:
  • tared (pre-weighed) 37-mm diameter low-ash polyvinyl chloride filter preceded by 10 mm nylon cyclone
  • maximum volume: 816 L
  • minimum volume: 408 L
  • maximum flow rate: 1.7 L/min
  • current analytical method: Gravimetric
  • method reference: OSHA PV2121 (partially validated)
  • note: OSHA personnel can obtain tared sampling media from OSHA-Salt Lake Technical Center (SLTC).
  • note: If the filter is not overloaded, samples can be collected up to an 8-hour period.

Exposure Limits and Health Effects (Updated September 6, 2012)

Standard Set By Exposure Limit Health Effect Codes -- Health Effects and Target Organs
OSHA PEL - General Industry
See 29 CFR 1910.1000 Table Z-1 (PNOR) and 29 CFR 1910.1000 Table Z-3 (Inert or Nuisance Dust)
5 mg/m3 TWA (15 mppcf) TWA HE10 -- lung disease
OSHA PEL - Construction Industry Not established  
OSHA PEL - Shipyard Employment Not established  
NIOSH REL Not established
See Appendix D
 
ACGIH TLV® No TLV established. See Appendix B of the TLV booklet for guidelines. HE10 -- lung disease, with compromised airway clearance
CAL/OSHA PELs 5 mg/m3 TWA  

mppcf = Millions of particles per cubic foot of air

Carcinogenic classification:

  • NTP: Not listed
  • IARC: Not listed
  • EPA: Not listed

EPA Inhalation Reference Concentration (RfC): Not established

ATSDR Inhalation Minimal Risk Levels (MRLs): Not established

NIOSH IDLH concentration: Not established

Notes on other potential health effects and hazards:

  1. Exposure to dusts may to decrease pulmonary function (Shieh et al. 2012).

Partial reference list:

  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Particulates (Insoluble) Not Otherwise Specified (PNOS). 2016.
  • Shieh, T.S., Chung, J.J., Wang, C.J., Tsai, P.J., Kuo, Y.C., Guo, H.R.: Pulmonary function, respiratory symptoms, and dust exposure among workers engaged in early manufacturing processes of tea: a cohort study. BMC Public Health. 12:121, Feb 13, 2012.

Chemical Sampling Information

By Name

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

By CAS Number

** All Trademarks are the property of their respective owners.

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