Mexico City received an environmental contingency warning for the third day in a row on Wednesday due to a high level of air ...

The 1,970 rail, trolleybus, and cable car workers who make Mexico City run could go out on strike as soon as March 13. Their union, the Tram Workers Alliance of Mexico (Alianza de Tranviarios de ...

It's been decades of big deals for the desert — but a yearslong fight over air pollution could endanger future ones ... to ...

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

It's been decades of big deals for the desert — but a yearslong fight over air pollution could endanger ... into the area from other states and Mexico. A team of researchers at Arizona State ...

The U.S. Environmental Protection Agency will soon decide whether to escalate the Phoenix area's air pollution status ... Phoenix the fifth most polluted city for ozone in the country last ...