https://www.mercurynews.com/2021/07/28/california-recommends-masks-for-all-indoors-amid-covid-surge/

The California Department of Public Health said Wednesday that even people vaccinated against COVID-19 should wear masks indoors in public places, a shift from its guidance in mid-June that the immunized were protected enough to forego masks.

“The delta variant has caused a sharp increase in hospitalizations and case rates across the state,” said Dr. Tomás J. Aragón, CDPH Director and State Public Health Officer. “We are recommending masking in indoor public places to slow the spread while we continue efforts to get more Californians vaccinated.”