A letter from top-level doctors and researchers arguing against the effectiveness of indoor mask mandates, along with pushback from health departments, cities and business groups, possibly played a role in a surprise decision not to re-institute the mandate in Los Angeles County last month

 https://www.dailynews.com/2022/08/13/doctors-from-usc-ucla-say-mask-mandates-for-covid-19-not-effective-as-mask-debate-goes-on/