Smoke from Canadian wildfires​ is headed toward Massachusetts, and prompting concerns about air quality in Boston.

Wildfire smoke from fires burning north of the border in Canada is dropping into the U.S. with upper-level winds. "The smoke has made its way all the way from Canada. This is a fire season that has really gotten off to a record-setting start,

An air quality alert is in effect for some parts of Massachusetts on Thursday as temperatures hit the 90s — and thunderstorms are on the radar. Here's when and where the rain is supposed to start.