* WHAT...The Minnesota Pollution Control Agency has issued an Air Quality Alert for fine particles pollution. The Air Quality Index (AQI) is expected to reach the Maroon or Hazardous category. * WHERE...East central and northeast Minnesota. * WHEN...Until 11 AM CDT Monday. * IMPACTS...Everyone is likely to be affected. Minor ashfall will be possible. * ADDITIONAL DETAILS...Heavy smoke will continue across the alert area. Some improvement will be possible Friday as an area of low pressure approaches before air quality deteriorates again on Saturday.