This much is true: Air pollution from Asia crosses the Pacific Ocean to North America, complicating efforts in the western United States to meet federal Clean Air Act limits for ozone. What’s unclear ...

It’s invisible, can't be smelled, is undetectable to the human eye, and can be fatal to humans, animals, plants and planet Earth as a whole. And with the onset of warmer weather in central Arizona, ...

Welcome to summer in Denver: hot days, cool nights and electronic billboards advertising ozone action alerts (like the one currently in effect), urging people to combine car trips and carpool if ...

Atmospheric researchers depart this month on NASA’s DC-8 research aircraft on their third survey of the global atmosphere. Taking place for the first time in Northern Hemisphere fall, the season gives ...

Warmer temperatures might be causing plants to emit more chemicals into the atmosphere, adding to one of Phoenix's worst air pollution problems.

As scorching temperatures this summer continue to rival the historic swelter of 2011, environmental experts say Austin's heat will probably lead to abnormally high air quality threats that, if not ...

Dear Jim: We like to use our swimming pool and spa, but we want to use fewer harsh chemicals to protect our skin and the environment. Are ozone water purifiers effective, and do they consume much ...