The smaller particles could in fact be more harmful as they can get through the body's natural defenses and cause significant health problems.

As of Monday morning, the NWS had issued red flag warnings for parts of California, New Mexico, Arizona, and Texas. In Arizona, a red flag warning was issued for much of the eastern region of the ...

Large wildfires are burning across the West and causing dangerous air quality in Nevada and California. Mesquite, Nevada and Scenic, Arizona, which sit across the state line from each other about ...