An air quality alert is in effect for all of Massachusetts as smoke from Canadian wildfires descends into the Boston area.

Each New England state has seen more days over the last five years when fine particulate matter or ozone exceeds air quality standards that are considered “unhealthy for sensitive groups.”

The return of wildfire smoke from fires burning in Canada has sparked another air quality alert in Minnesota, which will be in effect through Tuesday. The Minnesota Pollution Control Agency has placed the northern two-thirds of the state in the red alert zone,