Federal regulators ruled Monday that pollution from Mexico , not local sources, is why Phoenix fails air quality standards.

Billton Werito and his son Amari stand in front of a drilling pad near their house in an area where oil and gas drilling close to a local elementary school is causing students, including Amari, to ...

In a shocking revelation, our capital city’s air quality has deteriorated to levels worse than those of Mexico City, long considered one of the most polluted urban areas in Latin America. This ...

The EPA granted the Phoenix area an exemption from stricter air quality regulations, citing international emissions from Asia and Mexico that are outside local control.

A tall sierra rises around Monterrey, Mexico’s second-largest metropolitan area and Nuevo León’s state capital. Thick smog clings to the ground, obscuring the city’s once-imposing landscape. “We can’t ...

COUNSELOR, N.M. — On a Tuesday in March, Billton Werito drove his son Amari toward his house in Counselor, N.M., driving past natural gas pipelines, wellheads and water tanks. Amari should have been ...