Smoke from Canadian wildfires is worsening air quality in the eastern U.S. as several Midwestern states battle conditions deemed unhealthy. The fires have forced thousands of Canadians to flee their homes, with smoke extending as far as Europe. (AP video: Nicholas Ingram; Mark Vancleave; Amanda Swinhart)

Air quality worsens in eastern US as Canadian wildfire smoke hangs over Midwest

Smoke from Canadian wildfires is worsening air quality in the eastern U.S. as several Midwestern states battle conditions deemed unhealthy. The fires have forced thousands of Canadians to flee their homes, with smoke extending as far as Europe. (AP video: Nicholas Ingram; Mark Vancleave; Amanda Swinhart)