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When sampling measurements are to be compared with a TLV-C or OEL-C, the airborne chemical agent shall be sampled instantaneously as determined by a qualified person.

The highest of all measurements shall be compared with the TLV-STEL or OEL-STEL Footnote 1. A minimum of three samples shall be taken. If the airborne chemical agent is generated for a period of 45 minutes or less, consecutive 15-minute samples shall be taken for the entire duration of the work activity.

When sampling measurements are to be compared with a TLV-STEL or OEL-STEL, the airborne chemical agent shall be sampled for 15 minutes during the periods of maximum concentration as determined by a qualified person.

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When sampling measurements are to be compared with a TLV-TWA or OEL-TWA, the airborne chemical agent shall be sampled over the full work shift.Air samples shall be obtained from the breathing zone of the most highly exposed employees as determined by a qualified person.Where there is a likelihood that the concentration of an airborne chemical agent may exceed the value referred to in subsection 10.19(1), samples shall be taken to evaluate an employee’s exposure to the airborne contaminant.While the following requirements are not yet contained in the regulations, it is strongly recommended that work place parties follow these guidelines: (d) where no specific standards for the chemical agent are set out in the publications referred to in paragraph (b) and no method is available under paragraph (c), in accordance with a scientifically proven method used to collect and analyse a representative sample of the chemical agent Footnote 1. (c) in accordance with a method that collects and analyses a representative sample of the chemical agent with accuracy and with detection levels at least equal to those which would be obtained if the standards referred to in paragraph (b) were used or

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(b) in accordance with the standards set out by the United States National Institute for Occupational Safety and Health in the NIOSH Manual of Analytical Methods, fourth edition, volumes 1 and 2, as amended from time to time

10.19(3) where there is a likelihood that the concentration of an airborne chemical agent may exceed the value referred to in subsection (1), air samples shall be taken and the concentration of the chemical agent shall be determined Footnote 1.

(a) an airborne chemical agent in excess of the value for that chemical agent adopted by the American Conference of Governmental Industrial Hygienists, in its publication entitled Threshold Limit Values and Biological Exposure Indices, as amended from time to time Footnote 1.

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10.19(1) An employee shall be kept free from exposure to a concentration of.Subsection 10.19(1) of the COHSR states that: In addition, Canada Labour Code, Part II Footnote 2 requires an employee member of the work place health and safety committee or health and safety representative be present at least at the beginning of the compliance sampling. use of a National Institute for Occupational Safety and Health (NIOSH) method or any other scientifically proven method based on active sampling.chemical sampling of work place air for the entire work shift.See Section 6 for an explanation of these terms.

How should personal air sampling in a work place be conducted for: Following this procedure will ensure a uniform approach and yield consistent results. This procedure should be used when measurements of airborne chemical concentrations in federally regulated work places are taken by a qualified person to verify compliance regarding worker exposure to a chemical agent as per the requirements in Part X of the COHSR “Hazardous Substances”. This guideline will help Labour Program (LP) industrial hygiene specialists, employers, and industrial hygiene consultants in interpreting the sampling requirement regulations and in taking samples for compliance with Part X of the Canada Occupational Health and Safety Regulations (COHSR), “Hazardous Substances” Footnote 1. 7.7 Sampling and analysis quality control measures.7.4 Sampling for a ceiling value (C) of a hazardous substance.7.3 Sampling for STEL values of a hazardous substance based on 15 minute exposures.7.2 Sampling for the TWA value based on an 8-hour work shift exposure.7.1 Considerations for conduction sampling.