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

The United States has issued an advisory for hundreds of thousands of people, living in four states, to "stay indoors" as air quality continues to engulf the Midwest. This comes after smoke from ...

Smoke from Canadian wildfires and desert dust from the Sahara are creating unhealthy air quality from New York City to Miami.

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