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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
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IRSST's Production
Magazine and Newsletter
Scientific Watch
Documentation Center
Useful Links
Laboratory Services
Laboratories
Analysis and Testing Services
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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
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Master’s Scholarship and Supplement
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Postdoctoral Fellowship
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substance
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substance
October 28, 2025
Nitrous oxide
French name in the regulation:
Azote, protoxyde d'
CAS :
10024-97-2
Exposure Standards in RROHS regulation
Permissible exposure values (PEV)
ppm
mg/m
3
f/cc
Notes
TWAEV
50
90
-
-
STEV
-
-
-
-
Ceiling
-
-
-
-
Carcinogenicity
Sensitizer
Simple asphyxiant
Percutaneous
Prohibited use
Prohibited recirculation
Minimum exposure
Explosion hazard
Ototoxic
TWA adjustment for unusual work schedules
III
: Weekly adjustment
CNESST – Toxicological Index Service
Consult REPTOX file:
Nitrous oxide
Analysis:
Azote, protoxyde d'
Method: IRSST - 320-1
Sampling protocol
Sampling device:
Parameters:
Flow rate: -
TWA sampling volume: -
STEL sampling volume: -
Analytical protocol
Principle:
Direct reading instrument-Photoacoustic detection (DRI-PAD)
Remarks:
The minimum reported value is 0.09 mg/m³ (0.05 ppm).
Reference
IRSST. "Analyse de l'oxyde de carbone, le dixoyde de carbone et le protoxyde d'azote". Méthode 320-1. Non publiée.
Azote, protoxyde d'
Recommended method by the IRSST:
Method: NIOSH - 6600
Sampling protocol
Sampling device:
Passive monitor ACS # N-10
Parameters:
Flow rate: -
TWA sampling volume: -
STEL sampling volume: -
Remarks:
Contact the IRSST before sampling. Stable for 2 weeks after the sampling.
Analytical protocol
Principle:
Direct reading instrument-Photoacoustic detection (DRI-PAD)
Reference
NIOSH Manual of Analytical Methods, 4th ed., Method 6600 : Nitrous Oxide, 1994.
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