U.S. Centers for Disease Control and Prevention (CDC) Issues Updated Mask Guidance
Yesterday, the U.S. CDC issued new indoor masking recommendations and guidance, based on a county's (aka, locality/city) transmission level of COVID-19, seen most frequently in the US through the spread of the delta variant. On a 4-level scale (low to highly transmissible), indoor masking is recommended for those counties falling into the "substantial" or "high" transmission rate categories. See the current U.S. county list and transmission-level ratings. The U.S. CDC will update the county transmission ratings as new data is received.