Smoke from Canadian wildfires began to worsen air quality in the eastern U.S. on Wednesday as several Midwestern states ...

Nearly two dozen wildfires were burning in the Canadian province of Manitoba, just north of Minnesota and North Dakota.

Canada is having another bad wildfire season, and more than 27,000 people in three provinces have been forced to evacuate.

To check your state's air quality, visit AirNow's website, and plug in your zip code, city or state. Here's what to know as ...

Federal prosecutors have charged two Chinese researchers with smuggling a crop-killing fungus into the U.S. last summer. The ...