As smoke levels increase from wildfires in northern Ontario and Manitoba, a special air quality statement has been issued for Sarnia-Lambton.
Environment Canada said smoke is causing or expected to cause poor air quality and reduced visibility.
The national weather agency is encouraging residents to limit time outdoors and consider rescheduling outdoor activities and events.
"You may experience mild and common symptoms such as eye, nose and throat irritation, headaches or a mild cough," said the statement by Environment Canada. "More serious but less common symptoms include wheezing, chest pains or severe cough."
If you believe you think you're having a medical emergency, seek immediate medical assistance.
"People more likely to be impacted by outdoor air pollution, including people aged 65 and older, pregnant people, infants and young children, people with an existing illness or chronic health condition."
Environment Canada is also reminding homeowners to keep windows and doors closed as much as possible and use a clean good quality air filter in your ventilation system to protect your indoor air from wildfire smoke.
There are over a dozen active fires in Northern Ontario and the Manitoba Wildfire Service continues to respond to 27 active wildfires across the province.