Environmental and public health agencies often don't warn people about smoke-choked air until it's already swept in, researchers report.

There's a stark link between Canadian wildfire smoke and increases in the number of people going to the hospital for asthma symptoms in NYC.

After wildfire smoke from Canada blanketed the East Coast of the US, experts explain the serious health risks smoke poses.

How dangerous is wildfire smoke? An expert explains how smoke from a fire in the western United States can affect health on the other side of the country.

Another severe wildfire season may be coming, but few are ready for its toxic air. "It's startling how ill-prepared folks are for the smoke."

Damage from wildfire smoke may extend to the largest organ in the human body and our first line of defense against outside threats: the skin.

Long-term "ripple" effects of wildfires may not surface until months or years after the flames are extinguished, an expert explains.

Wildfire smoke from forest fires in wetter regions tends to have more of a cooling effect on the climate than smoke from dry bushfires, a study finds.

The far-reaching effects of wildfires and wildfire smoke are a growing problem, researchers say. Climate change is the "straw that broke the camel's back."

To find out how wildfire smoke changes over time, researchers flew through plumes to get a view from the inside. Their findings could improve forecasts.