The U.S. Senate is moving forward with an effort to block California's nation-leading standards for vehicle emissions.

The Houston-Pasadena area was named one of the most polluted cities in the U.S., according to a new study from the American ...

Senate Republicans agreed today to override Senate rules and use the Congressional Review Act to block California’s clean car waivers, which allow the state to set stronger standards to protect people ...

A new report on air quality across the U.S. offers a cloudy prognosis on the long-term health of about 156 million residents who live in areas that received an "F" in smog and soot pollution.

Top ten US metro areas for worst air pollution on West Coast Metro areas on the West Coast that have long been left polluted by roadways, agriculture, oil and gas industries and seemingly endless ...

"This year's report shows the dramatic impact that air pollution has on a growing number of people." In Connecticut, Fairfield County again posted the worst ozone pollution in the New York City ...

Multiple Texas metroplexes, including Dallas-Fort Worth, ranked among some of the worst areas for ozone pollution in the ...

Phoenix was ranked the fourth-worst metro area in the United States ... two of Arizona’s counties earned “F” ratings for air pollution. In addition, four counties earned the same abysmal ...