A special air quality statement has been issued for communities across southern Ontario.
Wildfire smoke is drifting into Windsor, Chatham-Kent, and Lambton County.
The smoke is expected to linger around throughout Sunday and possibly into Monday.
Environment Canada is encouraging people in the area to limit their time outside.
Those who stay outside for long periods of time may experience eye, nose, and throat irritation, headaches, or a mild cough. More serious symptoms include wheezing, chest pains, and severe cough.