Effectiveness of Face Mask or Respirator Use in Indoor Public Settings for Prevention of SARS-CoV-2 Infection — California, February–December 2021

This report describes face mask or respirator effectiveness in helping protect against COVID-19 infection.

Guidance for Face Coverings

High engagement in nonpharmaceutical interventions and their

High rates of observed face mask use at Colorado universities

The effect of activity and face masks on exhaled particles in

Association between self-reported masking behavior and SARS-CoV-2

Can wearing a mask prevent someone from getting COVID-19

N95 respirator - Wikipedia

Impact of Community Masking on SARS-CoV-2 Transmission in Ontario

Face Covering Information

High rates of observed face mask use at Colorado universities