Mosquito concerns arise in West Hollywood due to standing water at a stalled Melrose Triangle construction site, raising health risks with the potential spread of the West Nile virus. City officials have responded to mitigate the issue.

The Los Angeles County Department of Public Health has warned against water activities at several beaches due to high bacterial levels, while lifting the advisory for Ballona Creek at Dockweiler State Beach.

The LA County Department of Public Health warns of poor water quality at several popular beaches, advising against swimming and surfing due to high bacterial levels.

The first mosquitoes with West Nile virus of the year in Orange County were found in Huntington Beach. The OCMVCD is increasing efforts in surveillance and control to prevent spread.

LA County Public Health warns of high bacteria levels at several beaches, advising against ocean activities like swimming and surfing at certain spots due to health risks.

Southern California faces air quality issues due to Fourth of July fireworks, with a warning from the SCAQMD on lingering pollution and potential health risks.

Los Angeles County is experiencing a summer surge in COVID-19 cases earlier than usual, with Mayor Karen Bass testing positive. Public health officials are concerned about the increased transmissibility of new variants and low vaccination rates.

Los Angeles County advises caution at beaches due to high bacterial levels, impacting areas like Santa Monica Canyon and Topanga Canyon Beach. Some advisories lifted, including Avalon Beach.

Los Angeles County issues an excessive heat warning for various regions, urging precautions against heat-related illnesses and providing cooling centers and advice for staying safe during the heatwave.

Los Angeles County Department of Public Health issued warnings for increased bacterial levels at several beaches, advising against water activities at specific locations, but cleared Dockweiler State Beach.

LA County Public Health issues an ocean water use warning for various beaches due to elevated bacteria levels, with advisories in place until further notice. Some areas have had warnings lifted.

Los Angeles County has issued ocean water use warnings for several beaches due to high bacterial levels, affecting activities like swimming and surfing.

Santa Paula issued a "Do Not Drink" advisory due to potential tap water contamination after a break-in at the city's reservoir, cautioning residents against using the water until further testing is completed.