- Three and a half years into the pandemic, the Centers for Disease Control has issued updated guidelines on air exchange and filtration for indoor spaces: https://www.cdc.gov/coronavirus/2019-ncov/community/ventilation.html
- The CDC has also issued updated masking guidelines:
https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/about-face-coverings.html
NB: these recommendations are now tied to COVID-19 hospitalization levels, rather than levels of community spread (which the CDC is no longer charting).
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