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Los Angeles County health officials have identified three more cats with presumptive H5N1; the source of the virus has not yet determined, but experts suspect raw meat.

As the CDC confirmed severe illness in a Louisiana patient hospitalized with H5N1 bird flu, California Gov. Gavin Newsom declared a state of emergency related to the virus.

Under the Clean Air Act, California can adopt more stringent vehicle emission requirements than the federal government, but must obtain a waiver from the EPA.

California policymakers and environmentalists view recent Supreme Court actions as a small victory for clean air, but worry about future legal challenges.

The U.S. Forest Service has closed all trails to Mt. Baldy's peak until December 2025 to help the ecosystem recover from a fire. Hikers are defying the closures.

The Biden administration is offering Pacific Gas & Electric a record $15-billion loan guarantee to help it improve its electrical grid and meet fast-rising energy use.

The California Public Utilities Commission proposed to keep the natural gas field open without a closure deadline. That would run afoul of our energy needs and health.

For nearly two years, trash has been smoldering in a long-dormant portion of Chiquita Canyon due to the rare chemical reaction.

Supreme Court dismisses a red-state constitutional claim that targeted California's power to fight air pollution.

Three years after a raw sewage spill, residents living near L.A.'s Hyperion wastewater plant say they are still dealing with foul odors and health issues.