Air Quality Warning Issued for City of Toronto Due to Elevated Pollution Levels

Alert Details

Environment Canada and the Province of Ontario have issued a yellow air quality warning for the region. The alert is the result of stagnant winter weather conditions that are currently creating elevated pollution levels.

Affected Areas

This weather alert is specifically in effect for the City of Toronto.

What You Should Do

When air pollution levels are high, residents are advised to limit time spent outdoors. Consider reducing or rescheduling outdoor sports, activities, and events.

Individuals more likely to be impacted—including those aged 65 and older, pregnant people, infants, young children, outdoor workers, and people with existing chronic health conditions—should reduce or reschedule strenuous outdoor activities. If you experience symptoms such as eye, nose, or throat irritation, headaches, or a mild cough, reduce your activity level. Seek immediate medical assistance if you experience serious symptoms such as wheezing, chest pains, or a severe cough.

Expected Conditions

Light winds and stagnant weather conditions are expected to cause increasing levels of fine particles and nitrogen dioxide. High levels of air pollution are anticipated this evening and overnight, with Air Quality Health Index (AQHI) values expected to reach moderate to high risk levels.

Timeline

The alert is currently in effect as of March 5, 2026. High pollution levels are expected to persist through the night, with conditions likely to improve early Thursday morning. The current alert window is scheduled to expire at 11:03 AM.