The air quality index measures PM2.5, less than 2.5 microns particles, to determine the intensity of air pollution in cities.

Donald Trump has made drastic changes to the Environmental Protection Agency. Here’s how they could impact efforts to reform ...

The air we breathe every day is a bit cleaner than it was a few years ago, according to an Axios analysis of EPA data. Why it matters: Long-term exposure to poor air quality is harmful to your health.

Even if you don't live in an area where wildfires are typical, it's important to know how to protect your health.

during which air-quality advocates and public health experts warned attendees to consider the short- and long-term health effects of this disaster. “We now have the largest urban fire in the ...

Calculating air pollution from wildfires and other events has become more complicated. That doesn’t mean it’s necessarily more accurate.

Despite the green map from the South Coast Air Quality Management District showing the air quality reading in Los Angeles County being “good,” people should continue taking precautions ...

For decades, the United States has relied on airpower and the qualitative superiority of its aircraft to gain an advantage over its adversaries. But that advantage is rapidly eroding. The Chinese ...

In Santa Monica’s waterfront Palisades Park, the air was fresh enough for people to jog. Air quality, measured on a scale from good to hazardous, was good to moderate on Monday and mostly good ...

Jan. 11 at around 11 a.m. when Delta Air Lines Flight 1070 and United Airlines Flight 1724 experienced “a loss of required separation." The crews on both airplanes received “alerts” onboard ...

The advisory was extended through 7 p.m. Wednesday by the South Coast Air Quality Management District. It includes most of Los Angeles, Orange and Riverside counties in the South Coast Air Basin ...