Acts and Regulations

91-191 - General

Section 24
Disposition versions

Full text
Air contaminants – level of concentration
2022-79
24(1)An employer shall ensure that an air contaminant is kept at a level of concentration that does not constitute a hazard to the health or safety of an employee exposed to it and, if an occupational exposure limit exists in respect of an air contaminant, that the exposure of the employee to the air contaminant at no time exceeds the occupational exposure limit.
24(2)Where the installation of engineering controls is practical, an employer shall install and use appropriate engineering controls to comply with subsection (1).
24(2.1)An employer shall ensure that the engineering controls referred to in subsection (2) are designed, installed and maintained in accordance with good engineering practices.
24(2.11)An employer shall provide a respirator to an employee and the employee shall wear the respirator in the following circumstances: 
(a) the installation of engineering controls is not practical; or
(b) engineering controls are in the process of being installed.
24(2.2)An employer shall ensure that if ventilation is used as an engineering control, an air contaminant shall be controlled at the source by an effective local exhaust ventilation system.
24(2.21)If local exhaust ventilation is not practical, an employer shall ensure that general ventilation or a combination of general and local exhaust ventilation is used.
24(2.3)An employer shall ensure that a local exhaust ventilation system is designed so that under normal work conditions an employee’s breathing zone is not located between the source of contamination and the exhaust uptake.
24(2.31)An employer shall ensure that a ventilation system is not obstructed by material or equipment placed in front of the ventilation openings.
24(2.4)An employer shall ensure that an exhaust ventilation system used to control air contaminants in the work area remains in operation until the operation or work process is completed and the air contaminants generated are kept at a level of concentration that does not constitute a hazard to the health or safety of employees.
24(2.41)An employer shall ensure that an exhaust ventilation system used to control air contaminants in the work area is regularly inspected and monitored to ensure that the system remains effective.
24(2.5)If failure of an exhaust ventilation system could result in a hazard that is not readily apparent to affected employees, an employer shall ensure that the system is equipped with a device or other means to warn employees in the event of a system failure.
24(2.51)An employer shall ensure that an adequate supply of makeup air is provided to an exhaust ventilation system
(a) to maintain the effectiveness of the system, and
(b) to prevent an air contaminant from being drawn into the work area from another area.
24(2.6)An employer shall ensure that a ventilation system that discharges air from a work area shall comply with the requirements set out in subsections 20(3) and (4).
24(2.61)If an operation or work process produces a combustible or flammable air contaminant in concentrations that may present a risk of fire or explosion, the employer shall provide a separate exhaust ventilation system for the operation or work process.
24(2.7)An employer shall ensure that the electrical components of an exhaust ventilation system comply with the requirements of CSA Standard C22.1-18, “Canadian Electrical Code, Part 1”, as amended from time to time, if the components are in contact with the air flow of the exhaust ventilation system.
24(2.71)On or after April 1, 2024, an employer shall ensure that a dust collector that has an internal volume greater than 0.6 m3 and is used to control combustible dusts is located and constructed so that no employee will be endangered in the event of an explosion inside the collector.
24(2.8)When it is reasonably expected to present a danger to employees, an employer shall ensure that exhaust from any internal combustion engine operated in an enclosed place of employment is vented to the outdoors.
24(2.81)When powered mobile equipment, industrial lift trucks or other equipment powered by internal combustion engines are operated in an enclosed place of employment, an employer shall ensure that
(a) the engine is adequately serviced and maintained to minimize the concentration of air contaminants in the exhaust, and
(b) the place of employment is assessed to determine the potential for exposure of employees to harmful concentration levels of air contaminants in the exhaust.
24(2.9)An employer shall ensure that any powered mobile equipment, industrial lift truck or other equipment powered by internal combustion engines that is manufactured after April 1, 2024, and is regularly operated in an enclosed place of employment is
(a) equipped with an emission control system that includes feedback control for air/fuel ratio and a three-way catalytic converter, or other equivalent measures, if the powered mobile equipment, industrial lift truck or other equipment is powered by gasoline, propane or natural gas, or
(b) equipped with a scrubber or other emission control system that reduces particulate emissions by at least 70% when tested in accordance with the procedures established by the Mine Safety and Health Administration, US Department of Labor, or a standard offering equivalent or better protection, if the powered mobile equipment, industrial lift truck or other equipment is powered by diesel fuel.
24(3)Repealed: 2022-27
24(4)Where an employer or an employee has reason to believe that the level of concentration of an air contaminant may be approaching 50% of the occupational exposure limit, the employer shall ensure that the air is tested to determine the level of concentration of the air contaminant.
2022-27; 2022-79
Air contaminants – level of concentration
24(1)An employer shall ensure that an air contaminant is kept at a level of concentration that does not constitute a hazard to the health or safety of an employee exposed to it and, if an occupational exposure limit exists in respect of an air contaminant, that the exposure of the employee to the air contaminant at no time exceeds the occupational exposure limit.
24(2)Where the installation of engineering controls is practical, an employer shall install and use appropriate engineering controls to comply with subsection (1).
24(2.1)An employer shall ensure that the engineering controls referred to in subsection (2) are designed, installed and maintained in accordance with good engineering practices.
24(2.11)An employer shall provide a respirator to an employee and the employee shall wear the respirator in the following circumstances: 
(a) the installation of engineering controls is not practical; or
(b) engineering controls are in the process of being installed.
24(2.2)An employer shall ensure that if ventilation is used as an engineering control, an air contaminant shall be controlled at the source by an effective local exhaust ventilation system.
24(2.21)If local exhaust ventilation is not practical, an employer shall ensure that general ventilation or a combination of general and local exhaust ventilation is used.
24(2.3)An employer shall ensure that a local exhaust ventilation system is designed so that under normal work conditions an employee’s breathing zone is not located between the source of contamination and the exhaust uptake.
24(2.31)An employer shall ensure that a ventilation system is not obstructed by material or equipment placed in front of the ventilation openings.
24(2.4)An employer shall ensure that an exhaust ventilation system used to control air contaminants in the work area remains in operation until the operation or work process is completed and the air contaminants generated are kept at a level of concentration that does not constitute a hazard to the health or safety of employees.
24(2.41)An employer shall ensure that an exhaust ventilation system used to control air contaminants in the work area is regularly inspected and monitored to ensure that the system remains effective.
24(2.5)If failure of an exhaust ventilation system could result in a hazard that is not readily apparent to affected employees, an employer shall ensure that the system is equipped with a device or other means to warn employees in the event of a system failure.
24(2.51)An employer shall ensure that an adequate supply of makeup air is provided to an exhaust ventilation system
(a) to maintain the effectiveness of the system, and
(b) to prevent an air contaminant from being drawn into the work area from another area.
24(2.6)An employer shall ensure that a ventilation system that discharges air from a work area shall comply with the requirements set out in subsections 20(3) and (4).
24(2.61)If an operation or work process produces a combustible or flammable air contaminant in concentrations that may present a risk of fire or explosion, the employer shall provide a separate exhaust ventilation system for the operation or work process.
24(2.7)An employer shall ensure that the electrical components of an exhaust ventilation system comply with the requirements of CSA Standard C22.1-18, “Canadian Electrical Code, Part 1”, as amended from time to time, if the components are in contact with the air flow of the exhaust ventilation system.
24(2.71)On or after April 1, 2024, an employer shall ensure that a dust collector that has an internal volume greater than 0.6 m3 and is used to control combustible dusts is located and constructed so that no employee will be endangered in the event of an explosion inside the collector.
24(2.8)When it is reasonably expected to present a danger to employees, an employer shall ensure that exhaust from any internal combustion engine operated in an enclosed place of employment is vented to the outdoors.
24(2.81)When powered mobile equipment, industrial lift trucks or other equipment powered by internal combustion engines are operated in an enclosed place of employment, an employer shall ensure that
(a) the engine is adequately serviced and maintained to minimize the concentration of air contaminants in the exhaust, and
(b) the place of employment is assessed to determine the potential for exposure of employees to harmful concentration levels of air contaminants in the exhaust.
24(2.9)An employer shall ensure that any powered mobile equipment, industrial lift truck or other equipment powered by internal combustion engines that is manufactured after April 1, 2024, and is regularly operated in an enclosed place of employment is
(a) equipped with an emission control system that includes feedback control for air/fuel ratio and a three-way catalytic converter, or other equivalent measures, if the powered mobile equipment, industrial lift truck or other equipment is powered by gasoline, propane or natural gas, or
(b) equipped with a scrubber or other emission control system that reduces particulate emissions by at least 70% when tested in accordance with the procedures established by the Mine Safety and Health Administration, US Department of Labor, or a standard offering equivalent or better protection, if the powered mobile equipment, industrial lift truck or other equipment is powered by diesel fuel.
24(3)Repealed: 2022-27
24(4)Where an employer or an employee has reason to believe that the level of concentration of an air contaminant may be approaching 50% of the occupational exposure limit, the employer shall ensure that the air is tested to determine the level of concentration of the air contaminant.
2022-27
Air contaminants – level of concentration
24(1)An employer shall ensure that an air contaminant is kept at a level of concentration that does not constitute a hazard to the health or safety of an employee exposed to it and, where a threshold limit value exists in respect of an air contaminant, that the exposure of the employee to the air contaminant at no time exceeds the threshold limit value.
24(2)Where the installation of engineering controls is practical, an employer shall install and use appropriate engineering controls to comply with subsection (1).
24(3)Where practical, an employer shall ensure that air contaminants are removed at their source.
24(4)Where an employer or an employee has reason to believe that the level of concentration of an air contaminant may be approaching 50% of the threshold limit value, the employer shall ensure that the air is tested to determine the level of concentration of the air contaminant.