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IRSST - Institut de recherche Robert-Sauvé en santé et en sécurité du travail
OHS Research
Research at the IRSST
Reference Framework
Scientists Directory
Publications and Tools
IRSST's Production
Magazine and Newsletter
Scientific Watch
Documentation Center
Useful Links
Laboratory Services
Laboratories
Analysis and Testing Services
Laboratory Methods
Masks Efficacy Evaluation
Workplace Air Contaminants
Slip Resistance Test for Protective Footwear
Loan, Calibration and Repairs
Recognition Programs
CQ Fibres
Quality Control of Fiber Counts
CQ Vrac
Recognized Laboratories
Interlaboratory quality
control program
Guides and Tools
Instruments and Sampling Material
Register
Research Fund and Partnerships
Research Fund and Partnerships
Grants
Scholarships
Master’s Scholarship and Supplement
Doctoral Scholarship and Supplement
Postdoctoral Fellowship
Research partnerships
Institute
About
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substance
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substance
August 30, 2025
Nitrogen dioxide
French name in the regulation:
Azote, dioxyde d'
CAS :
10102-44-0
Synonyms:
Dioxyde d'azote
Exposure Standards in RROHS regulation
Permissible exposure values (PEV)
ppm
mg/m
3
f/cc
Notes
TWAEV
3
5,6
*
-
-
STEV
5
9,4
*
-
-
Ceiling
-
-
-
-
Carcinogenicity
Sensitizer
Simple asphyxiant
Percutaneous
Prohibited use
Prohibited recirculation
Minimum exposure
Explosion hazard
Ototoxic
TWA adjustment for unusual work schedules
IV
: Daily or weekly adjustment ( the more stringent of the two)
CNESST – Toxicological Index Service
Consult REPTOX file:
Nitrogen dioxide
Analysis:
Azote, dioxyde d'
Recommended method by the IRSST:
Method: MANUEL - ILD
Sampling protocol
Sampling device:
Parameters:
Flow rate: -
TWA sampling volume: -
STEL sampling volume: -
Remarks:
Refer to the user's guide accompanying the instrument.
Analytical protocol
Principle:
Direct reading instrument-Electrochemical cell (DRI-elec)
Remarks:
Nitrogen dioxide is quantified in the field with a direct-reading instrument (DRI).
Reference
Direct Reading Instrument (DRI). Consult the manufacturer's manual.
Following the amendment of Appendix 1 of the Quebec Regulation respecting occupational health and safety (RSST, RLRQ, c. S-2.1, r. 13), part of Quebec Occupational Health and Safety Act, which came into effect on March 26, 2020, the TWAEV, STEL and Ceiling values for certain substances are now expressed in
ppm
. For these substances, the IRSST performed the conversion calculations to express these TWAEV, TWA and Ceiling values in mg/m
3
, which thus appears in its Sampling Guide for Air Contaminants in the Workplace
(Guide d'échantillonnage des contaminants de l'air en milieu de travail )
and the associated Substance Data Sheets. However, it is imperative to refer to the values expressed in the RSST which are legally binding.
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