Smoke fills northern Minnesota skies as Greenwood fire grows

DULUTH – Smoke from the state's largest wildfire drove air quality to very unhealthy levels in northeastern Minnesota on Thursday, with local officials telling residents to keep windows shut and stay indoors whenever possible.

An air-quality alert is in place for northeastern counties through 8 p.m. Friday, and east-central counties around Lake Mille Lacs should also expect hazardous air through 9 a.m. Friday. Some parts of the region will see thicker smoke as winds shift.

"Fine particle levels are expected to reach ... a level that is considered unhealthy for everyone," the Minnesota Pollution Control Agency said.

https://www.startribune.com/smoke-fills-northern-minnesota-skies-as-greenwood-fire-grows/600091199/