"Wildfire smoke clears, but air quality alerts persist in US and Canada"

Air quality conditions over much of the eastern US are forecast to slowly improve this weekend after plumes of harmful air from hundreds of wildfires in Canada traveled south, but schools in some metro areas will undergo remote learning Friday as officials remain on guard about pollution exposure. The dense clouds of smoke have postponed professional sports games, grounded flights due to poor visibility, shuttered zoos and beaches as well as forced many to mask up when outdoors. Climate experts have warned such events are becoming more frequent due to human-induced climate change.