How to Select, Wear, and Clean Your Mask | CDC

Summary of Current Recommendations : more information at cdc.gov

Wear masks with two or more layers to stop the spread of COVID-19
Wear the mask over your nose and mouth and secure it under your chin
Masks should be worn by people two years and older
Masks should NOT be worn by children younger than two, people who have trouble breathing, or people who cannot remove the mask without assistance
Do NOT wear masks intended for healthcare workers, for example, N95 respirators
CDC does not recommend the use of gaiters or face shields. Evaluation of these face covers is on-going but effectiveness is unknown at this time.

Your Most Pressing Questions About Masks | CR

Consumer Reports Chief Scientist “Here’s what you really need to know” at consumer reports.org

This page answers a lot of those questions we all have -regarding bandanas , masks with valves , and is it okay NOT to cover your nose ?

and more on Aerosolization of viral particles

Aerosolization continues to be an under recognized or poorly understood secondary source of infection. Reminder that the virus has been shown to linger in the air of small , poorly ventilated rooms such as a private restroom at a workplace , and my more recent concern , a lavatory on an airplane which I liken to “a phone booth in the sky “, very noisy but is it ventilated adequately to clear the air in-between two users back-to-back ? I have reservations and would not remove my mask in an airplane lavatory , for now.

The CDC now has recognized on September 18, 2020 that aerosols are perhaps the most important route of COVID19 transmission :

-This was reported on CNN September 20, 2020 based on CDC September 18, 2020 revisions to their website which can be viewed here: How COVID-19 spreads | CDC -Airborne Transmission of SARS-CoV-2 : JAMA July 13, 2020 Generation and Behavior of Airborne Particles (Aerosols) by Baron et al. : CDC pdf