On Thursday at 11:51 p.m. EDT an updated air quality alert was reported by the National Weather Service in effect until Saturday at 4:15 a.m. EDT for Midland, Bay, Huron, Saginaw, Tuscola, Sanilac, Shiawassee,

There is an air quality alert for all counties in Michigan until midnight Friday, the Michigan Department of Environment, Great Lakes and Energy reported. Pollutants across the state are expected to be in the Unhealthy for Sensitive Groups (USG, Orange AQI) range Wednesday and Thursday, with some locations reaching the Unhealthy (Red AQI) range.

It expires on Friday at midnight, due to elevated levels of fine particulate (PM2.5), the Department of Environment, Great Lakes, and Energy said.