ST. PAUL, Minn. (AP) _ The thick haze caused by smoke from more than 100 Canadian wildfires has triggered an air pollution health advisory across a large part of Minnesota.

The Minnesota Pollution Control Agency reports that the air quality is rated unhealthy for everyone for a large part of northwestern and north-central Minnesota, including Detroit Lakes and Brainerd.

An even larger swath is rated unhealthy for sensitive groups. It runs from near Lake of the Woods, through St. Cloud and the Twin Cities metro area, to the Iowa border. The MPCA says people in that area with lung or heart disease, older adults, children, and people participating in activities that require heavy or extended exertion may experience adverse health effects.

Air quality is expected to remain poor due to fine particles until midday Sunday.