While the smoke may cloud your vision of the sky or ruin a day at the beach on this week's warmest days of the season so far, it is more than just a nuisance. All across the U.S., the smoke is causing poor air quality, which can cause health effects from mild symptoms in the healthy to dangerous risks for sensitive groups.

It’s due to wildfire smoke rolling in from Canada. These wildfires are burning in areas of Central Canada along the Canadian Plains. The smoke first moved into the Upper Midwest but has since made its way into the Northeast. An air quality alert has been issued for the coast.