As a day progresses the air near the water’s surface can warm some and the inversion erodes. The smoke will lift and disappear into a larger space in the air over Michigan. So the strong visual of thick smoke turns into a faint haze of smoke all over the sky of Michigan.

As hundreds of wildfires burn across Canada, smoke is traveling south and potentially affecting Americans’ health. Here's why it can be so dangerous.

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.