A mix of Saharan Dust blown across the Atlantic by the trade winds and smoke from wildfires in Canada is leading to lower air quality across much of the eastern part of the United States this weekend.

Although the majority of wildfires are occurring in western Canada, smoke from these fires has been drifting eastward, impacting air quality in areas around the Great Lakes and the U.S. Northeast, shows AirNow, the Environmental Protection Agency's interactive air quality map.