Although it is presently only available for Apple employees, Apple has designed a face mask for their employees to wear.

Apple engineers designed a custom face mask for employees — take a look
https://www.cnbc.com/2020/09/28/apple-engineers-designed-protective-face-mask-for-employees.html

It appears to be quite effective. Apple is trying to help in these trying times, and here's a quote from the article:

"Apple has announced other Covid-19 prevention measures recently. For example, the latest software update for the Apple Watch includes a handwashing feature that automatically detects when the wearer is washing their hands, and starts a 20-second timer. And the new Apple Watch Series 6 announced on Sept. 18 includes a blood oxygen monitor."

My wife, Zee, has an Apple watch, and she found the timer on the hand washing feature to be quite handy.

Jim Hamm