Delta is dead, long live Omicron. California is already bringing back mask mandates. Starting tomorrow on Wednesday, masks are required in any indoor capacity, regardless of vaccination status. The Omicron variant brings much uncertainty, since its characteristics, such as its virulence or how current vaccines work against it, have yet to be fully analyzed.
This new mask mandate will be in place for 30 days which means it will expire on January 15th, 2022.