State officials are delaying action on air quality permits for three uranium mines after one test revealed a spike in soil contamination.

The Game and Fish Department said state officials recently signed an agreement with federal Interior Department officials to establish a bison herd with genetic lineage from the Wind Cave National Park in western South Dakota.

A ruling Monday from the U.S. Supreme Court could make it harder for state environmental officials to reach settlements with some polluters to clean up hazardous waste sites.

The Obama administration’s revised Clean Power Plan goals could be more palatable for Arizona, but big questions remain as to how they will affect the state’s utilities, their customers and the fate of the Apache Generating Station.

The Arizona Game and Fish Department and the Arizona Attorney General’s office filed a lawsuit today against the federal government over the Mexican gray wolf recovery program, saying the feds have failed to make a complete plan to recover the species.

The Department of Transportation says it has finished distributing 1,800 license plates that became available in May 2014 as previous owners turned in plates due to reasons that included moving out of state and selling qualifying vehicles.

The Sierra Club gave nearly every Republican legislator an “F’’ in the 2015 environmental report card it issued today – and gave Gov. Doug Ducey a “D.”

A national government watchdog group has hired a lawyer and is prepared to sue the Arizona Corporation Commission to compel the release of public records.

A study by researchers from the University of California, Irvine suggests that groundwater loss in the Colorado River Basin is not only higher than expected, but that other water sources may be inadequate to fill the gaps if it disappears.

Arizona’s spending on alternative fuels for its vehicle fleet continues to be relatively small even though the fleet is almost entirely capable of using such fuels.