Switching from diesel to electric trains dramatically improved the air quality aboard the San Francisco Bay Area's Caltrain commuter rail line, reducing riders' exposure to the carcinogen black carbon ...

Cities in California, Texas and Arizona are expecting air quality to become unhealthy for sensitive groups on Thursday.

Despite modern cars generally being cleaner and more fuel efficient, a University of California, Riverside study shows that ...

When a horrific firestorm enveloped Southern California in January, it affected everyone who calls the region home. Even ...

Valero Energy (NYSE:VLO) said Wednesday it has submitted notice to the California Energy Commission that it plans to idle, ...

With the first phase of the Atwater-Merced Expressway complete, setbacks have impacted its next phases leaving some uncertainty to the overall timeline, according to Merced County officials. The multi ...

Challenging a slew of state climate-related laws and programs, President Trump’s April 8, 2025 executive order (EO) set the stage for more ...

One of the online tools eliminated by Trump was used after the 2023 Maui wildfires to urge local health officials to prioritize evacuating pregnant native Hawaiian women in the third trimester.

Founder of Avelo Airlines said the government contract will provide the company with ‘stability’ to continue flying ...

Standards for Ambient-Air Quality, California State Department of Public Health (December, 1959).* California will also require that total hydrocarbons in automobile-exhaust gases shall not exceed ...