Community groups are fighting an unusual Louisiana law that restricts how they use data from air-quality monitors, saying it ...

"Louisiana wants to silence us for doing what the state refuses to do — tell people what’s in the air they breathe," one ...

Produced primarily by the burning of fossil fuels, ammonium nitrate is a substantial portion of particulate pollution, a ...

The House and Senate both voted to loosen regulations on air pollutants like dioxin and mercury, which are associated with ...

While federal law requires publicly disclosed monitoring of major pollutants, fence-line communities in Louisiana have long ...

Philadelphia received straight “F’s” for air quality in the American Lung Association’s annual assessment of the nation’s air ...

With the fate of EPA regulations uncertain, advocates say local environmental protection efforts, like a community air ...

A new report on air quality across the U.S. offers a cloudy prognosis on the long-term health of about 156 million residents who live in areas that received an "F" in smog and soot pollution.

TUCSON, Ariz. (13 News) - On Wednesday, southern Arizona had one of its first ozone alerts of the year. It will be just one of many in the coming months. The beginning of April is normally the start ...

Personal exposure to nitrogen dioxide and the oxidative potential of fine particulate matter (PM2.5), but not PM2.5 mass, ...

For community groups to allege violations of environmental rules, a state law says groups have to use federally-approved testing equipment, and it sets restrictions for analyzing and sharing the data.

Wildfire smoke can cause poor air quality and trigger major health issues. Here's everything Arizonans need to know and how ...