Effectiveness of Face Mask or Respirator Use in Indoor Public

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

LAC, DPH

When and Why to Wear a Mask

The effect of activity and face masks on exhaled particles in

Multiple studies show that face masks reduce the spread of COVID

View of Effectiveness of manufactured surgical masks, respirators, and home-made masks in prevention of respiratory infection due to airborne microorganisms

Effectiveness of behavioural interventions to influence COVID-19

What is the efficacy of standard face masks compared to respirator masks in preventing COVID-type respiratory illnesses in primary care staff? - The Centre for Evidence-Based Medicine

Mask studies reach a new scientific low point

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

N95 Respirator Masks FAQs

Masking against COVID: a visual guide

What Are the Benefits of Wearing a Face Mask? - WSJ