Canadian Wildfires Cause Unhealthy Air Quality and Eerie Skies in US.

More than 400 wildfires are burning across Canada, with smoke and unhealthy air quality levels blanketing multiple Canadian provinces, much of the Great Lakes region and parts of the northeastern United States. While forest fires are a natural part of the ecosystem of Canada's boreal forests, the size, ferocity and number of fires this year is decidedly abnormal. Rising temperatures, prolonged droughts and changing rain patterns are making many of North America's forests more prone to fire, and climate change is believed to be a contributing factor. The smoke from the fires is also affecting US air quality, with multiple cities experiencing extremely hazardous levels.