As humans continue to pump more gases into the atmosphere, you've probably seen air quality alerts more often, but what does ...

red and purple, to maroon for the most hazardous levels. The colors are used on air quality forecast maps. No city had a worse sustained reading in 2021 than Salem, Ore., where the index almost ...

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

In an effort to improve community health and provide transparent environmental data, the City of Pasadena has installed nine ...

And, according ... New Study Tracks Air Pollution and CO2 Emissions Across Thousands of Cities Worldwide May 7, 2025 — In a sweeping new study of more than 13,000 urban areas worldwide ...

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.

The 2025 study, based on EPA data through 2023 (the most recent full year available), showed an increase of 25 million people living in areas with failing air quality grades compared with the ...

Smog from wildfires sweeping the nation has left tens of millions more Americans to breathe toxic air even as man-made forms of pollution fall, according to a new study released Wednesday.

and my area on the map was dark purple on the Apple radar, so I’m like, No thanks, I’m just staying inside,” Ms. Blair said. (That color would indicate the air quality is at hazardous levels.) ...

On "red" days, the air pollution is deemed "unhealthy" for everyone." Like many eastern states, Pennsylvania also saw the highest number of "red" and "purple" particle pollution days since reports ...