Particulates Not Otherwise Classified (PNOC) (Pr)

Particulates Not Otherwise Classified (PNOC) (Pr) (See Remark)

French name in the regulation: Poussières non-classifiées autrement (PNCA) (Pr)

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)

	ppm	mg/m³	f/cc	Notes
TWAEV	-	3	-	Pr
STEV	-	-	-	-
Ceiling	-	-	-	-

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

Remark :	PARTICULATES NOT OTHERWISE CLASSIFIED (PNOC): Particulates present in the air that meet the following conditions are considered Particulates Not Otherwise Classified (PNOC) or nuisance particulates: (1) no permissible exposure value is provided for them in Part 1 of Schedule I to this Regulation; (2) they are insoluble or poorly soluble in water; (3) their toxicity is low and they have no effect other than lung overload or mechanical irritation.

Remark :

PARTICULATES NOT OTHERWISE CLASSIFIED (PNOC):

Particulates present in the air that meet the following conditions are considered Particulates Not Otherwise Classified (PNOC) or nuisance particulates:

(1) no permissible exposure value is provided for them in Part 1 of Schedule I to this Regulation;

(2) they are insoluble or poorly soluble in water;

(3) their toxicity is low and they have no effect other than lung overload or mechanical irritation.

TWA adjustment for unusual work schedules

1C : No adjustment

CNESST – Toxicological Index Service

Consult REPTOX file:

Analysis:

Weight measurement for inhalable and respirable dusts

Method: IRSST - 424

Sampling protocol

Sampling device:
Sampling media required:

#IRSST	Description
924	Plastic IOM, PVC filter, 5 µm, 25 mm

Parameters:
Flow rate: 2,0 L/min
TWA sampling volume: 480 L
STEL sampling volume: -

Principle: Gravimetric measurement (Grav)
Remarks: The minimum reported value (MRV) is 60 µg for respirable dusts and 200 µg for inhalable dusts. The analytical uncertainty (CVa) is 2.3% for respirable dusts and 3.4% for inhalable dusts. Additional information is available in Info-Labo 1991-03 and in Info-Labo 2019-06. The weight measurement method for dusts is by definition non-specific.

Reference

IRSST. "Détermination simultanée des poussières de fraction respirable et inhalable dans l'air". Méthode 424. Non publié.

IRSST - Institut de recherche Robert-Sauvé en santé et en sécurité du travail

substance