Air quality over the US and Canada is improving after extreme wildfire conditions. But the smoke and altered skies will take time to clear

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.

​CNN.com – RSS Channel 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. 

​Read More 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.