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

The Massachusetts Department of Environmental Protection has issued an air quality alert across much of the state, due to high ozone levels. The alert will be in effect from 11 a.m. to 11 p.m. Monday, Aug. 11.

The National Weather Service reported an air quality alert at 8:43 a.m. on Monday in effect until 11 p.m. for Northern Worcester and Southern Worcester as well as Middlesex, Essex, Hampshire, Hampden,