PM2.5 — is expected to push the Air Quality Index over 100, reaching levels unhealthy for sensitive groups, including children, older adults, and people with heart or lung conditions.

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

Coughing a lot lately? You’re not alone. Wildfires in Canada are causing Metro Detroit a lot of problems, including an air quality alert that continues through Monday night.