Smog warning in effect in Montreal, Laval

Montreal and the area were under a smog warning on Dec. 26, 2024. (Maria Sarrouh / CTV News)

Montrealers waking up after a night of food and festive joy are advised to take caution outdoors as a smog warning is in effect.

Environment and Climate Change Canada issued the warning for the Montreal and Laval regions in addition to Vaudreuil, Valleyfield-Beauharnois and Mont-Tremblant—Sainte-Agathe.

“High concentrations of pollutants are expected this morning, which will result in poor air quality, especially in metropolitan areas where pollutant emissions are more significant,” the warning reads.

The warning adds that asthmatic children and those with respiratory issues or heart conditions should take extra caution and avoid intense outdoor physical activity during the warning.

Environment Canada said that wood heating is the main source of the fine particles that contribute to smog in Quebec winters, and advises residents to contact municipalities to check any rules regarding solid fuel burning appliances.

In Montreal, it is prohibited to use a wood-burning stove or other appliance unless it emits fewer than 2.5 grams of particles per hour.

During smog warnings, even certified solid fuel-burning appliances are prohibited in Montreal and residents can be fined if caught.