Air polluted by the Canadian wildfires is back in the United States this week. There are nearly 900 wildfires burning across Canada, but the smoke this week will be coming from the western part of the country. Air quality alerts were issued for multiple areas, including the Midwest, the Great Lakes, central Tennessee and North Carolina, as well as the Northeast. “Canadian wildfire smoke will remain in the picture through Tuesday as northwesterly winds aloft that originate out of the Canadian Prairies continues to direct more smoke into the Lower 48,” the Weather Service said. The post Smoke Pollution From Canadian Wildfires Returns to Parts of U.S. appeared first on New York Times.