pollution

The Environmental Protection Agency is proposing to roll back federal coal ash cleanup rules, raising concerns about groundwater contamination at dozens of coal plants and waste dumps across the Mountain West.

The U.S. already has about 3,000 data centers — and that number is expected to grow quickly in the coming years. A new report finds much of that growth is shifting away from cities and into rural areas, including in the Mountain West.

A coalition of environmental groups is suing the Environmental Protection Agency, alleging the agency missed a key deadline tied to a stricter national standard for soot pollution. The case could affect air quality protections across the Mountain West.

A new national report finds access to nearby nature in the United States is deeply unequal. And that the gap is closely tied to race, income and pollution exposure. Researchers say the pattern shows up across the country, including in the Mountain West.

Health and environmental advocates vow to fight it in court.

The EPA’s rejection of Colorado’s regional haze plan and orders from the Trump administration to keep coal plants online in the state have advocates worried about damage to protected areas.

Yellow snow isn't the only concern when snowmelt is a main drinking water source.

The new ‘dredge-and-fill’ rules address a gap by the U.S. Supreme Court’s Sackett decision two years ago, which drastically shrunk the number of waterways eligible for federal protections.

New research shows that wildfires are a major contributor to ozone pollution, and can significantly exceed the impacts of human-generated emissions.

A new report shows tens of thousands of abandoned mines dot the U.S., including parts of the Mountain West. Experts say these sites pose pollution threats due to being in areas that are at high risk for flooding.