The City of Ottawa is experiencing some of the worst air quality in the world due to wildfire smoke on Friday, with the poor air quality expected to continue into Saturday.

A special air quality statement remains in effect for Ottawa, eastern Ontario and western Quebec, warning smoke is causing poor air quality and reduced visibility.

“High risk air quality due to wildfire smoke is expected over the area overnight. As smoke levels increase, health risks increase,” Environment Canada said in an updated statement at 5 p.m. Friday.

“Limit time outdoors. Consider reducing or rescheduling outdoor sports, activities and events.”

Ottawa’s air quality was rated 10+ or “Very High Risk” at 4 p.m., after a slight improvement earlier in the day. The Air Quality Health Index shows Ottawa’s air quality will be or 10 or “High Risk” tonight, improving to to “5-Moderate Risk” tomorrow.