Charts for each state in the West depict top five chemicals released in air, water and land, and top 10 facilities.
A loophole in the Toxics Release Inventory keeps mining pollution, except for that caused by smelters, off its lists.
Top 20 companies are ranked according to how many pounds of pollution they release into the air, water and land.
The EPA's Toxic Releases Inventory report documents the annual industrial pollution of land, air and water in the U.S., with six of the top 10 polluters located in the West.
The polluting, coal-fired Hayden Power Plant in northeastern Colorado agrees to reform, to activists' delight.
The Grand Canyon Visibility Transport Commission issues an ambitious proposed air-quality cleanup blueprint for the Colorado Plateau.
The Grand Canyon Visibility Transport Commission gives people a chance to comment on the need to clean up the air in Grand Canyon and the Colorado Plateau.
Eastern Washington grass farms are upset by an announced phaseout of the practice of late-summer field burning, after clean air activists complain.
Industry claims that the Grand Canyon's haze problem is naturally caused rile artists and photographers and others who really know how to look at landscapes.
The Grand Canyon Visibility Transport Commission gets ready to send the EPA its recommendation for restoring clean air to the Colorado Plateau.
Although much of the West had an unusually wet winter, fires are already starting to rage across the dry Southwestern states.
Environmentalists say manmade causes such as logging and road-building contributed to flooding and landslides in the Northwest during a wet winter.
The coal-fired Hayden Power Plant is found guilty of polluting the air of the nearby Mount Zirkel Wilderness area.
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