WASHINGTON – A consortium of federal and tribal agencies reported Jan. 24 that a five-year, $110 million project to clean up uranium contamination in the Navajo Nation had addressed the most urgent risks there.

WASHINGTON – The U.S. Fish and Wildlife Service on Jan. 25 proposed listing a small freshwater fish as an endangered species and setting aside almost 300 miles of Arizona and New Mexico streams as critical habitat for the fish.

The U.S. Environmental Protection Agency says it has exceeded its goals in assessing structures on the Navajo Nation for uranium contamination.

Arizona Game and Fish officials are going on the record as opposing a proposal to designate 43,400 acres of Prescott National Forest land as protected wilderness.

Everyday life in Maricopa means living with the highest levels of particulate-matter pollution in the state, according to an analysis of Environmental Protection Agency monitor data from 2000 to 2010.

For the second time in less than two weeks, a Tucson-based conversation group has sued the federal government over its handling of the Mexican gray wolf.

FLAGSTAFF — The U.S. Environmental Protection Agency has imposed new pollution limits on three coal-fired Arizona power plants, aiming to protect the environment and air quality for wilderness areas and landmarks such as the Grand Canyon.

A federal appeals court ruled Monday that the government did not violate federal environmental law when it failed to subject annual plans for operation of the Glen Canyon Dam to a thorough environmental review.

Arizona is tired of waiting for the federal government to act on the state’s proposed air-quality plan and “very well may” sue the Environmental Protection Agency if action is not taken soon, a state official said Thursday.

The U.S. Environmental Protection Agency is proposing to approve Arizona’s plan to control sulfur dioxide and soot at three power plants in the state.