An air quality alert has been issued for the Boston area and other parts of Massachusetts today. And while the region has seen smoke from Canadian wildfires and fires burning in the U.S., that's not what's driving Thursday's warning.

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.

An air quality alert was issued for the Boston area Thursday, not because of haze from Canadian wildfires but because of ozone levels.