From our good colleague Ben (@USMortality on Twitter) we now have some very strong evidence and...
CHARTS BY IAN MILLER
Check out our charts for various locales, with dates of mask mandates superimposed on cases or hospitalizations. Sources are at the bottom of the page.
1. COVID Tracking Project Data Download: https://covidtracking.com/data/download
2. Our World in Data: https://github.com/owid/covid-19-data/tree/master/public/data
3. San Diego Open Data Portal: https://sdgis-sandag.opendata.arcgis.com/search?groupIds=2ee90ba1cdf84381935c591c2a125a45
4. Orange County, CA: https://data-ocpw.opendata.arcgis.com/search?tags=health