Los Angeles County may reinstate an indoor mask mandate. More than half the U.S. population lives in counties where Covid-19 cases and hospitalizations are high enough that people should wear masks in indoor public settings, according to Centers for Disease Control and Prevention data. The CDC’s latest assessment represents a significant jump from the week before, reflecting the added pressure that the easily spread Omicron BA.5 subvariant is putting on the U.S. since it became the dominant Covid-19 strain . Over a third of U.S. counties now fall into the CDC’s “high” category, up from one in five counties a week earlier.