Michael McGough The Sacramento Bee The U.S. Centers for Disease Control and Prevention on Tuesday issued new guidance saying people should once again wear masks in indoor public settings, regardless of vaccination status, in areas with elevated levels of COVID-19 spread â a classification applying to a vast majority of California by population, including the entire Sacramento region. Support local news coverage and the people who report it by subscribing to the Napa Valley Register. Special offer: 1 year for $26 Dr. Rochelle Walensky, director of the CDC, announced the new guidelines in a media briefing Tuesday. Walensky said that due to the risk posed by the Delta variant, masks are recommended in areas with transmission rates classified as "high or substantial."