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Ozone

General Description

Synonyms: Triatomic oxygen

OSHA IMIS code: 1980

CAS number(s): 10025-15-6

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
0.1 ppm (0.2 mg/m3) TWA
HE7 -- headache
target organs: brain, central nervous system
HE10 -- lung damage, chronic respiratory disease
HE11 -- pulmonary congestion, edema, and hemorrhage
HE14 -- eye, nose, throat, and respiratory irritation
OSHA PEL - Construction Industry
See 29 CFR 1926.55 Appendix A
0.1 ppm (0.2 mg/m3) TWA
HE7 -- headache
target organs: brain, central nervous system
HE10 -- lung damage, chronic respiratory disease
HE11 -- pulmonary congestion, edema, and hemorrhage
HE14 -- eye, nose, throat, and respiratory irritation
OSHA PEL - Shipyard Employment
See 29 CFR 1915.1000 Table Z - Shipyards
0.1 ppm (0.2 mg/m3) TWA
HE7 -- headache
target organs: brain, central nervous system
HE10 -- lung damage, chronic respiratory disease
HE11 -- pulmonary congestion, edema, and hemorrhage
HE14 -- eye, nose, throat, and respiratory irritation
NIOSH REL 0.1 ppm (0.2 mg/m3) TWA HE7 -- headache
target organs: brain, central nervous system
HE10 -- lung damage, chronic respiratory disease
HE11 -- pulmonary congestion, edema, and hemorrhage
HE14 -- eye, nose, throat, and respiratory irritation
ACGIH TLV® (2001) Heavy work:
0.05 ppm (0.1 mg/m3) 8-hour TWA
Moderate work:
0.08 ppm (0.16 mg/m3) 8-hour TWA
Light work:
0.1 ppm (0.2 mg/m3) 8-hour TWA
All workloads:
0.2 ppm (0.39 mg/m3) 2-hour TWA
A4
HE7 -- headache
target organs: brain, central nervous system
HE10 -- lung damage, chronic respiratory disease
HE11 -- pulmonary congestion, edema, and hemorrhage
HE14 -- eye, nose, throat, and respiratory irritation
CAL/OSHA PELs 0.1 ppm (0.2 mg/m3) TWA
0.3 ppm (0.6 mg/m3) STEL
HE10 -- lung damage and decreased lung function

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: 5 ppm

Notes on other potential health effects and hazards:

  1. Ozone can increase sensitivity to bronchoconstrictors and allergens and may facilitate the development of asthma. In fact, thunderstorm events (when pollen and ozone are at higher levels), have coincided with up to 10-fold increases in asthma hospital admissions (Anderson et al. 2001).
  2. Systemically, ozone has been reported to mimic the effects of ionizing radiation, including damage to chromosomal structures. There does, however, appear to be a partial tolerance to this with repeated exposure (NIOSH 1978).
  3. In bleachery workers, exhaled nitric oxide levels could be a marker for airway inflammation after exposure to high peaks of ozone (Olin et al. 2004).

Partial reference list:

  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Ozone. 2016.
  • Anderson, W., Prescott, G.J., Packham, S., Mullins, J., Brookes, M. and Seaton, A.: Asthma admissions and thunderstorms: a study of pollen, fungal spores, rainfall, and ozone. QJM 94(8): 429-433, 2001.
  • California Occupational Safety & Health Standards Board: Initial and Final Statement of Reasons. August 3, 2010.
  • NIOSH: Occupational Health Guideline for Ozone. September 1978.
  • NIOSH/CEC/IPCS: International Chemical Safety Cards - Ozone. April 26, 1993.
  • Olin, A.C., Andersson, E., Andersson, M., Granung, G., Hagberg, S. and Toren, K.: Prevalence of asthma and exhaled nitric oxide are increased in bleachery workers exposed to ozone. Eur. Respir. J. 23(1): 87-92, 2004.

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