Smoke warning still in effect but relief is coming to Ontario

Residents across southern Ontario are being urged to limit time outdoors as thick smoke from wildfires burning in northwestern Ontario causes very poor air quality and reduced visibility throughout the region.

Environment Canada says smoke is affecting much of the province, including major Golden Horseshoe communities such as Toronto, Mississauga, Brampton, Hamilton, Burlington, Oakville, Milton, Vaughan, Markham, Richmond Hill, Pickering, Ajax, Whitby, Oshawa, St. Catharines, Niagara Falls and surrounding areas.

Areas shaded in orange are under a warning for air quality on Thursday. Map: Environment and Climate Change Canada

Conditions are expected to remain poor through Thursday, with some improvement possible by Friday morning.

Environment Canada warns that during periods of heavy wildfire smoke, everyone’s health can be affected regardless of age or overall health status.

Residents are being advised to limit time outdoors and consider rescheduling or cancelling outdoor sports, activities and events until air quality improves.

Common symptoms associated with smoke exposure include eye, nose and throat irritation, headaches and mild coughing. More serious symptoms can include wheezing, chest pain and severe coughing. Anyone experiencing severe symptoms or a medical emergency should seek immediate medical attention.

Health officials say certain groups face a greater risk from wildfire smoke, including seniors aged 65 and older, pregnant people, infants and young children, those with existing illnesses or chronic health conditions, and people who work outdoors. These individuals are encouraged to avoid strenuous outdoor activity and seek medical care if symptoms develop.

Residents are also being urged to protect indoor air quality by keeping windows and doors closed as much as possible. However, during periods of extreme heat, staying cool should remain a priority.

To reduce indoor smoke exposure, officials recommend using the highest-quality air filter compatible with a home’s ventilation system or operating a certified portable air cleaner that filters fine particles.

Anyone who must spend time outside is encouraged to keep outdoor exposure to a minimum. Experts say a properly fitted respirator-type mask, such as a NIOSH-certified N95 or equivalent, can help reduce exposure to harmful smoke particles, although it does not eliminate all health risks.

Officials are also encouraging residents to check on neighbours, family members and others who may be more vulnerable to the effects of wildfire smoke.

Air quality conditions can change quickly depending on wind direction and wildfire activity, and residents are encouraged to monitor local forecasts and air quality reports for the latest information.