Montreal is the most polluted city in the world today, as air quality hits ‘dangerous levels’

Environment Canada has issued a poor air quality statement for Montreal today, with the Weather Network noting that the city became “the most polluted major city in the world” this afternoon as air quality hit “dangerous levels.” Montreal, along with other cities in Quebec and Ontario, are experiencing poor air quality and reduced visibilities today due to ongoing wildfires in the Prairies. These smoky conditions are expected to persist into Sunday.

According to IQAir, air quality in the city is currently “unhealthy.”

Environment Canada suggests limiting time outdoors and cancelling outdoor activities and events. Those most likely to suffer health effects are people over 65, pregnant women, young children, people with chronic health conditions and those who work outdoors, who should avoid strenuous activity and seek medical attention if they experience symptoms.

Mild symptoms that could affect anyone under these conditions include nose, eye and throat irritation as well as headaches, while more severe symptoms include wheezing, chest pains or a severe cough.

“As smoke levels increase, health risks increase. If you must spend time outdoors, a well-constructed, well-fitting and properly worn respirator-type mask (such as a NIOSH-certified N95 or equivalent respirator) can reduce your exposure to the fine particles in the smoke.”

Smoke from Western Canada is currently affecting air quality. The Air Quality Health Index (AQHI) can help assess health risk level. To learn more, or to consult your local AQHI, visit : https://t.co/zdao3qRTwZ #QCstorm pic.twitter.com/HNAlHcvSvn

— ECCC Weather Quebec (@ECCCWeatherQC) June 6, 2025

For the latest weather and air quality updates in Montreal, please visit the Environment Canada website.

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