WINONA, Minn. – Fine-particulate smoke from Canada forest fires sent air quality measures into an unhealthy category range from Lake Superior to the Iowa border. At 2 p.m. the Minnesota Pollution Control Agency reported air quality index in southeast Minnesota above 160 on a 500-point scale:
Air quality index
Green: Good.
Yellow: Moderately healthy.
Orange: Unhealthy for vulnerable people.
Red: Unhealthy for everyone.
Brown: Very unhealthy (brown.
Black: Hazardous.
Image: Minnesota Pollution Control Agency