In Quebec, employers have a clear and non-negotiable legal responsibility regarding the air quality in their workplaces. These obligations, governed by the Act respecting occupational health and safety (LSST) and the Regulation respecting occupational health and safety (RSST), aim to protect the health of 4.5 million Quebec workers against the risks associated with air pollution in the workplace.

Fundamental Obligation of Protection

Section 51 of the LSST imposes on employers a general obligation to ensure the health, safety, and physical well-being of their employees. This responsibility explicitly extends to the quality of the air breathed by workers during their working hours. The employer must identify, assess, and control all atmospheric hazards present in their establishment.

This obligation of results means that employers cannot rely on good intentions alone: ​​they must achieve measurable and documented results regarding the air quality of their facilities.

Compliance with Exposure Values

The Health and Safety Regulations (RSST) establish permissible exposure values ​​(PEVs) for more than 400 chemical substances commonly found in the workplace. Employers must ensure that the concentration of each contaminant remains below these regulatory thresholds over an 8-hour work period.

These limits cover industrial solvents, dust, metal fumes, toxic gases, and volatile organic compounds. Failure to comply with these thresholds constitutes a regulatory violation punishable by fines and administrative sanctions.

Monitoring and Measurement Obligations

Employers must implement an air quality monitoring program adapted to their sector of activity. This monitoring includes periodic measurements carried out according to the protocols established by the Robert Sauvé Research Institute for Occupational Health and Safety (IRSST).

The frequency of measurements varies depending on the type of contaminants present and the risk level of the activity. High-risk sectors such as the chemical industry, metallurgy, and construction require more frequent monitoring than administrative offices.

Compliant ventilation system

Section 101 of the Health and Safety Regulations (RSSO) requires employers to adequately ventilate their establishments by mechanical or natural means. This ventilation must comply with the fresh air exchange standards defined in Schedule III of the regulation.

Ventilation systems must be inspected, cleaned, and maintained regularly to maintain their effectiveness. The employer must document these interventions and keep maintenance records.

Employee Training and Information

Employers are required to inform their employees about the atmospheric hazards present in their work environment and the protective measures in place. This information must be adapted to the workers’ level of understanding and updated regularly. Training on the correct use of respiratory protective equipment is an integral part of these obligations when such equipment is required.

Mandatory Professional Assessment

Given the technical complexity of air quality measurements, employers often need to call on qualified experts to meet their legal obligations. These certified professionals have the specialized equipment and expertise necessary to conduct sampling in accordance with IRSST protocols.

The professional assessment documents regulatory compliance, identifies sources of contamination, and recommends appropriate corrective measures. This expertise provides essential legal protection for the employer.

Consequences of Non-Compliance

Failure to comply with these obligations exposes employers to administrative, criminal, and civil penalties. The CNESST can impose fines ranging from $600 to $300,000, depending on the severity of the violation. Work stoppage orders can completely paralyze operations until compliance is achieved.

Neglectful employers also expose themselves to occupational disease compensation claims and civil lawsuits from their employees. Don’t be one of them; contact us quickly by clicking here: .