Multiple U.S. states and Canadian provinces are experiencing poor air quality from wildfire smoke. Here's where.

Summer heat will return to the Twin Cities on Monday as air quality concerns linger for parts of Minnesota. The week will start dry and warm, with highs near 90 in the metro. The northern half of the state remains under an air quality alert through 6 p.m. due to Canadian wildfire smoke, the National Weather Service said.

EDT the National Weather Service reported an air quality alert in effect until Thursday at 1:30 a.m. EDT for Cass and Berrien counties.

An Air Quality Alert has been issued for parts of northern New York and Vermont today because of Canadian wildfire smoke.

The Minnesota Pollution Control Agency has issued a statewide air quality alert through 9 a.m. Monday because of Canadian wildfire smoke.

Unhealthy air quality is forecast, with periods of Very Unhealthy air quality possible for several hours. Folks should expect to see and smell smoke, and Air Quality Alerts are in effect. Conditions will improve slightly tonight through Sunday.