OHS Code

Published Date: July 01, 2009
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Part 4 Chemical Hazards, Biological Hazards and Harmful Substances

Section 20 Airborne concentration measurements

(1) If a person measures the airborne concentration of a harmful substance for the purposes of complying with the occupational exposure limits as required by this Code, the person must make the measurement in accordance with any one of

(a) the NIOSH Manual of Analytical Methods, 4PthP Edition (August 1994), published by the United States Department of Health and Human Services, as amended up to and including the 2PndP supplement (January 15, 1998),

(b) Sampling and Analytical Methods published by the U.S. Occupational Safety and Health Administration,

(c) Methods for the Determination of Hazardous Substances guidance published by the Health and Safety Executive of Great Britain,

(d) EPA Test Methods published by the U.S. Environmental Protection Agency (EPA),

(e) Workplace Air Contamination Sampling Guide published by the Institut de recherché Robert-Sauvé en santé et en sécurité du travail (IRRSST),

(f) ISO Standards and Guides of Air Quality published by ISO Technical Committee TC146,

(g) Analyses of hazardous substances in air/DFG Deutshce Forschngsgemeinschaft – Commission for the Investigation of Health Hazards of Chemical Compounds in the Work Area, or

(h) methods or procedures that are approved by a Director of Occupational Hygiene.

(2) If there is no analytical method or procedure that complies with subsection (1), an employer may use a continuous reading direct-reading instrument to measure airborne concentrations of a harmful substance for the purposes of complying with the occupational exposure limits as required by this Code provided that the instrument is used, calibrated and maintained according to the manufacturer’s specifications.

(2.1) An employer must ensure that the person undertaking airborne measurements is competent to do so.

(3) If the person is counting fibres, the person must apply NIOSH Method 7400 and only to particles that meet the size criteria for fibres.

(4) An employer must record the results of the measurements and keep them for 3 years from the date on which the measurements were taken.