Nitrogen monoxide

According to Decree 280-2024 published on February 28, 2024, in the Gazette officielle du Québec, the amendment to the Appendix 1 of the Regulation respecting occupational health and safety (RSST, RLRQ, c. S-2.1, r. 13) will come into force on March 14, 2024. These regulatory changes have not yet been incorporated into the current Substance Data Sheets of the Sampling Guide for Air Contaminants in the Workplace. An update is currently underway and will be available as soon as possible. Consequently, the information contained in the data sheets of substances modified or added in Decree 280-2024 is partially inaccurate or incomplete. Please consult our infoLABO (in French only) for more details. Please contact our client service: [email protected] for further information.

Nitrogen monoxide

French name in the regulation: Azote, monoxyde d'

CAS : 10102-43-9

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)

	ppm	mg/m³	f/cc	Notes
TWAEV	25	31	-	-
STEV	-	-	-	-
Ceiling	-	-	-	-

Carcinogenicity		Sensitizer
Simple asphyxiant		Percutaneous
Prohibited use		Prohibited recirculation
Minimum exposure		Explosion hazard
Ototoxic

TWA adjustment for unusual work schedules

II : Daily adjustment

CNESST – Toxicological Index Service

Consult REPTOX file: Nitrogen monoxide

Analysis:

Azote, monoxyde d'

Method: IRSST - 06-A

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: Nitric oxide is quantified in the field with a direct-reading instrument (DRI). The minimum reported value is 1.2 mg/m³ (1 ppm). The reference method corresponds to calibration of the DRI.. Azote monoxyde quantified with DRI.

Reference

IRSST. "Étalonnage d'un instrument à lecture directe pour la mesure du monoxyde d'azote dans l'air". Méthode 06-A. Non-publiée.