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

The smoke floating over the border shared between America and Canada is now impacting air quality in states as far south as Texas, AirNow's data shows. The EPA has declared the air quality in states near the Canadian border as "unhealthy or "unhealthy for sensitive groups."

Firefighters in Utah, Arizona and California are all battling wildfires, including the still-growing blaze that closed the Northern Rim of the Grand Canyon. In the Midwest and East, a thick haze in the sky caused by smoke from more than 700 Canadian wildfires have prompted air quality alerts in ten states.