Like much of the U.S., Chicago was under a thick hazy blanket of wildfire smoke, creating dangerous conditions for anyone who ...

Tens of thousands of people who fight wildfires spend weeks working in toxic smoke and ash wearing only a cloth bandanna, or ...

Smoke from Canadian wildfires has blanketed Michigan this summer, with 31 days of warnings for parts of Michigan..

Republican lawmakers are blaming Canada for not preventing and containing wildfires, whose smoke has fouled the air in ...

Firefighters are tackling a major moorland wildfire for a sixth day, with smoke from the blaze visible up to 80 miles (128km) ...

While the smoke is worst along the Western Slope where the fires are burning, levels are also fluctuating on the Front Range.

Researchers found that wildfire smoke can raise ozone to dangerous levels, posing hidden health risks even in remote areas.

The hazy air hovering over US cities, including Chicago and New York, this summer is reminding Americans of just how ...

Forecasting wildfire smoke is hard. We review the best tools to help you predict when unhealthful levels of smoke are coming.

The smoke from the wildfires that burned through Los Angeles in January smelled like plastic and was so thick that it hid the ...