The concentration of pollutants in the air is measured regularly at 11 permanent sampling stations and two temporary stations for special projects. The city’s air quality surveillance network publishes the results of its tests in an interactive map (in French). The scientific community can also view the network’s open data (in French) to monitor air quality.The interactive air quality map is temporarily unavailable.

Throughout the year, Montréal also inspects companies to ensure that current standards and regulatory requirements are respected. Corrective measures may be required if atmospheric emissions are judged to be problematic.

Wood heating

Do you have a solid-fuel-burning fireplace or stove (wood, ecological logs, coal, pellets)? You must register it. To use your appliance, it must conform with current standards. A permit is also necessary to install, replace or remove it. In case of a SMOG alert in Montréal, you cannot use your fireplace or stove. A fine may be issued.

Motor vehicle idling

In Montréal, leaving the engine of a vehicle idling when it is stationary is prohibited. The purpose of the regulation is to maintain air quality and reduce greenhouse gas emissions.

Permits for companies

Establishments whose activities generate air pollution must hold a permit. To receive one, they must demonstrate compliance with current by-laws and regulations. Once a permit has been granted, samples to measure the amounts of pollutants discharged into the air may be required to verify that regulatory requirements and standards are respected.

Reporting an issue

You can report a situation that seems abnormal or suspicious relating to air quality. Complaints are analyzed within 24 working hours. You will be advised of the measures taken.