Heavy, pungent wildfire smoke darkened skies in the U.S. from the Great Lakes to parts of the East Coast.

Wildfire smoke from Ontario has severely degraded air quality across the northeastern United States. Chicago recorded "Very Unhealthy" levels of fine particulate pollution on…

NEW YORK (AP) — Heavy, pungent smoke from Canadian wildfires darkened skies in the U.S. on Thursday, from the Great Lakes to parts of the East Coast, reducing visibility for