Almost half of everyone who lives in the United States breathes unhealthy levels of air pollution, according to the American ...

“State of the Air” uses letter grades to measure unhealthy levels of ground-level ozone air pollution (also known as smog), ...

The American Lung Association has revealed that nearly half the U.S. population resided in areas with dangerous levels of air ...

From her home on Louisiana's "Cancer Alley," Lydia Gerard looks down at her 8-month-old great-granddaughter and wonders if ...