Following the arrest of two U.S. citizens accused of starting the largest wildfire in Arizona history, Sen. Steve Gallardo demanded that U.S. Sen. John McCain apologize for comments he made that some wildfires in the state were started by illegal immigrants.

Tribal economies could see a boost with a new rule that makes it easier — and possibly timelier — for some industrial facilities to obtain permits to do business on American Indian reservations.

The Arizona Corporation Commission today approved a waiver for a western Arizona utility to receive renewable energy credits for energy generated by a Phoenix-area waste-to-energy plant.

A proposal to reverse a federal ban on new mining claims near the Grand Canyon survived a committee vote Tuesday and could go to the full House as early as next week.

The decision by the state agency in charge of implementing air quality policy to repeal the Clean Cars program in favor of emission standards that aren’t as stringent led to a chorus of protests from environmentalist and health advocates.

While all sides agree that Arizona’s air quality woes require a long-term fix, the latest effort to adopt a less stringent standard for curbing car emissions shows that the state program to combat air pollution is defined less by consistency and more by the winds of Arizona’s ever-changing political landscape.

Nuclear Regulatory Commission report said more employees at the Palo Verde Nuclear Generating Station need regular training on the plant’s Severe Accident Mitigation Guidelines, and that training exercises are rare.

Sen. Sylvia Allen, a Snowflake Republican, has asked for Senate President Russell Pearce’s permission for her to convene the Border Security, Federalism & State’s Sovereignty Committee to investigate the Wallow Fire.

Deep within the canyon, a few miles removed from the mule trains of the popular Bright Angel Trail, Horn Creek creates a ribbon of green vegetation here before plunging toward the Colorado River.

But the handful of people allowed to camp in this splendid isolation receive a warning with their permits: Don’t drink the water when Horn Creek is flowing. It’s radioactive.

A group of attorneys representing children and young adults began to file legal actions Wednesday in every state and the District of Columbia in an effort to force government intervention on climate change.