Environment Canada has issued an Orange Air Quality Warning because smoke from the wildfires in northwestern Ontario is expected to move into the Chatham-Kent and Windsor area.
Environment Canada says air quality is expected to deteriorate later on Wednesday, and the poor air quality may persist into Friday.
Health and climate experts urge the public to limit time spent outdoors during heavy smoke conditions, noting that everyone’s health is at risk regardless of age or health status.
They also encourage people to reschedule or cancel outdoor sports, activities, and events when air quality is poor.
"You may experience mild and common symptoms such as eye, nose and throat irritation, headaches, or a mild cough," said Environment Canada. "More serious but less common symptoms include wheezing, chest pains, or severe cough."
Experts also urge people to seek immediate medical attention if they believe they are experiencing a medical emergency due to poor air quality.
"People more likely to be impacted by wildfire smoke, include people aged 65 and older, pregnant people, infants and young children, and people with an existing illness or chronic health condition," the national weather and climate agency noted.
People who work outdoors should avoid strenuous activities outdoors and seek medical attention if experiencing symptoms, said Environment Canada.
The agency also noted that windows and doors should be closed as much as possible during poor air quality warnings.
Officials also urge the public to use the highest-quality air filter that their ventilation system can handle, and/or a certified portable air cleaner that can filter fine particles.
"When there is an extreme heat event occurring with poor air quality, prioritize keeping cool. Protect your indoor air from wildfire smoke," explained Environment Canada. "Check in on others who are in your care or live nearby who may be more likely to be impacted by wildfire smoke."
If people can't avoid spending time outdoors, experts advise using a well-constructed, well-fitting, and properly worn respirator, such as a NIOSH-certified N95 or equivalent respirator.
They said a mask can reduce exposure to the fine particles in the smoke, but added that even though exposure may be reduced by using masks outdoors during poor air quality days, risks to health can remain.
