Orange skies over parts of US and Canada engulfed in wildfire smoke

Canada wildfire smoke continues to bring unhealthy air quality to Midwest, Northeast

100 million Americans facing dangerous wildfire smoke

Canadian wildfire smoke drifts into the US

Canadian wildfire smoke affecting air quality conditions in U.S.

Midwest sees world's worst air quality as wildfire smoke spreads

Wildfire smoke covers DC as officials warn of health risks

Wildfire smoke covers DC as officials warn of health risks

Health experts say to mask up amid wildfire smoke