Smoke warning in effect across Toronto and southern Ontario

Residents across southern Ontario are being warned that smoke from forest fires in northwestern Ontario is causing poor air quality and reduced visibility throughout much of the region.

Environment Canada says smoky conditions are affecting communities including Toronto, Mississauga, Brampton, Hamilton, Burlington, Oakville, Milton, Halton Hills, Oshawa, Whitby, Ajax, Pickering, Markham, Vaughan, Richmond Hill, Aurora, Newmarket, Barrie, Guelph, Kitchener, Waterloo, Cambridge, London, St. Catharines, Niagara Falls, Welland and Windsor.

The agency says poor air quality may persist into Thursday in some areas as wildfire smoke continues to move across southern Ontario.

Health officials warn that as smoke levels increase, so do the risks to health. Residents are being encouraged to limit time outdoors and consider reducing or rescheduling outdoor sports, activities and events until conditions improve.

People exposed to the smoke may experience common symptoms such as 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.

Those most vulnerable to wildfire smoke include seniors, pregnant people, infants and young children, people with existing illnesses or chronic health conditions, and those who work outdoors. These groups are being advised to avoid strenuous outdoor activities and seek medical advice if symptoms develop.

Officials recommend keeping windows and doors closed as much as possible to reduce smoke entering homes. Residents can also improve indoor air quality by using high-quality furnace filters or certified portable air cleaners capable of filtering fine particles.

Anyone who must spend extended periods outdoors should consider wearing a well-fitting N95 or equivalent respirator mask to help reduce exposure to harmful smoke particles.

Authorities are also encouraging residents to check on neighbours, family members and others who may be more vulnerable to the effects of wildfire smoke as the air quality advisory remains in effect.