From Environment Canada on August 4, 2025, at 5:49 p.m.

Smoke is causing or expected to cause poor air quality and reduced visibility.

Smoke from forest fires is expected to continue to affect much of southern Ontario tonight. The wildfire smoke may persist into Tuesday and possibly Wednesday.

Air quality and visibility due to wildfire smoke can fluctuate over short distances and can vary considerably from hour to hour.

As smoke levels increase, health risks increase. Limit time outdoors. Consider reducing or rescheduling outdoor sports, activities, and events.

You may experience mild and common symptoms such as eye, nose and throat irritation, headaches or a mild cough. More serious but less common symptoms include wheezing, chest pains or severe cough. If you think you are having a

See Full Page