Smoke from ongoing wildfires across Canada continued to drift into parts of the United States on Wednesday, causing hazy skies and triggering air quality alerts in multiple states across the upper Midwest and Northeast.

The National Weather Service announced air quality alerts in 10 states Tuesday as smoke from the Canadian wildfires continues to spread across the U.S. border. The alerts come as the Canadian Interagency Forest Fire Centre lists 746 active fires Tuesday morning,