The Valley has seen decades of big business deals and population growth. A yearslong fight over air pollution could now ...

The EPA's decision on the Valley's ozone nonattainment issue could have big impacts on public health and the local economy.

The EPA says Phoenix-area air quality has worsened to “serious” levels, a designation that would trigger growth restrictions, ...

Others primarily point to pollutants traveling into the area from other states and Mexico. A team of researchers ... to get a handle on the region's air pollution problem. Even so, officials ...

America's border is in crisis and it's not just about illegal immigration. One hundred billion gallons of sewage is flowing ...

Can you imagine a future where the quiet hum of electric vehicles replaces the familiar rumble of gasoline engines? That ...

"Sometimes you can't see air pollution — and sometimes you can ... to pollutants traveling into the area from other states and Mexico. A team of researchers at Arizona State University is ...