Michigan's air, which has been tainted for several days by wafting smoke from Canadian wildfires, is expected to improve over the weekend, state officials said.

But don't breathe too deep a sigh of relief, experts warned: Conditions could decline again early next week.

An Air Quality Advisory issued by the Michigan Department of Environment, Great Lakes, and Energy's (EGLE) Air Quality Advisory for several southern Michigan counties, including Metro Detroit, expires at midnight Friday.

Heavy smoke from hundreds of Canadian wildfires has made the air in parts of the state a hazy gray-brown and unhealthy for sensitive groups throughout the past week. By Friday morning, the smoke had mostly blown out of the state, EGLE said, except in the southernmost areas.

The agency said a slowly movin

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