Wildfire smoke has sparked the national weather agency to issue air quality warnings around the county of Grande Prairie and the northwestern corner of Alberta, and air quality statements for much of northern Alberta.

Poor air quality fuelled by wildfires burning across the Prairies left a large swath of the country enveloped in a haze again on Saturday, but Environment Canada said the situation is expected to improve over the weekend.

An air quality map shows conditions improving in the U.S. on Friday as smoke from the Canadian wildfires subsides.