Smoke from numerous Canadian wildfires is again impacting the Philadelphia region this week, with environmental authorities ...

Forecasters say weak winds have left Canadian wildfire smoke to linger over the U.S. Stronger winds are expected to bring relief later in the week.

Smoke from ongoing Canadian wildfires has led to some of the worst air quality in the world across parts of the U.S.

Blazes burning across Canada are sending air quality plummeting in Detroit, Chicago, New York and other major U.S. cities ...

Smoke from Canadian wildfires hovered over several Midwestern states Saturday, bringing warnings of unhealthy air for at ...

Minneapolis had the fifth worst air quality among 125 cities worldwide on Saturday morning, according to an international air ...

Health officials from Minnesota to Maine have issued alerts warning of poor air quality from wildfires burning in Canada.