Everyone can be affected, but sensitive groups such as people with lung or heart disease, older adults, people who are pregnant, children, and those who spend a lot of time outdoors are at greater risk.

Gun rights organizations filed a lawsuit Tuesday challenging a new California law that bans certain types of Glock-style semi-automatic firearms.

A sister-in-law of 2012 Republican presidential nominee and former U.S. senator Mitt Romney was found dead following a five-story fall at a Southern California parking garage, authorities said Monday.

National Weather Service (NWS) meteorologists in Southern California warned that some parts of the state could face significant debris flows and flash flooding on Tuesday amid bouts of heavy rainfall. Newsweek reached out to the NWS office in Los Angeles by phone for comment.

A new California law will effectively ban a deceptive policing tactic used for years against the families of people killed by police and popularized by the nation’s largest developer of law enforcement policy manuals.

LOS ANGELES (AP) — Barack Obama is entering the fight for U.S. House control by appearing in a 30-second ad urging California voters to approve a November ballot proposal that could add as many as five Democrat-held House seats in California.

Mitt Romney's sister-in-law was found dead on Friday evening next to a parking garage in the Town Center area of Santa Clarita, a suburb just north of Los Angeles, according to officials. The Los Angeles County Sheriff's Department told ABC News it is conducting a death investigation into the death of 64-year-old Carrie Romney of Valencia.

California's Proposition 50 ballot measure could determine House control as Barack Obama campaigns for redistricting changes ahead of the 2026 election.