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Southern Ontario residents are being warned of worsening air quality and reduced visibility as wildfire smoke from the Prairies moves into the region.
Environment and health officials say the smoke is causing or expected to cause poor air quality conditions, which can fluctuate significantly over short distances and time periods.
Air quality is expected to improve gradually from north to south on Thursday.
As smoke concentrations rise, so do health risks—particularly for older adults, infants, pregnant people, those with chronic illnesses, and anyone working outdoors. Officials recommend limiting time outdoors and considering rescheduling or reducing strenuous outdoor activities and events.
Common symptoms of smoke exposure include irritation of the eyes, nose and throat, headaches and mild coughing. More serious symptoms such as wheezing, chest pains or a severe cough may occur in rare cases. People experiencing severe symptoms should seek medical attention immediately.
Residents are advised to keep windows and doors closed and to use clean, high-quality filters in home ventilation systems. Certified portable air cleaners can also help filter fine particles. During concurrent extreme heat events, officials say cooling should be prioritized.
Health officials are also urging the public to check in on neighbours, friends, and family members who may be more vulnerable to poor air quality.
