https://reason.com/2021/12/14/california-reinstates-mask-mandate-as-omicron-panic-devours-team-blue/

Despite no new public information that would suggest there is anything novel to fear from the omicron variant of COVID-19—which seems to be producing mild cases in vaccinated individuals—many municipalities are regressing into full-blown panic and reimposing mitigation measures. Case in point: Democratic Gov. Gavin Newsom reinstated California's mask mandate, beginning December 15 and lasting until January 15.