Cities in California make up a significant proportion of the country's most polluted metropolitan areas when it comes to air ...

California is one of the states hit especially ... Pennsylvania and Delaware, as shown in the map below. This is the second-most severe category on the CDC's map, after "very high," which includes ...

A map of California shows where drivers are advised against taking detours during a winter storm. A map of California shows where drivers are advised against taking detours during a winter storm.

CAL FIRE has launched an interactive tool to map California's urban tree canopy. The tool is designed for researchers, ...

A moderately strong, 5.2-magnitude earthquake struck in Southern California on Monday, according to the United States Geological ... to update the shake-severity map. The San Diego County Sheriff ...

Were heavy rains enough to pull California out of drought? Here's which areas are still dry and which are drought-free for the first time in 5 years.

An earthquake with a preliminary magnitude of 5.2 hit Southern California on Monday morning. Experts with the Seismological ...