Air Quality - Masks

First it seemingly comes down to the fit of a mask.... if there is leakage, then it's not going to matter. (See: Nathan will rock a goatee/no beard)

- sizing tool: https://cambridgemask.com/fitting-your-mask/

Vogmask and Cambridge (both ~$30) both seem like great companies, both using Nelson Labs for their testing (one of the tests happened out on Redwood Road) - with good results. ~Six months life span on each.

As for more disposable...

3M may be less expensive, and as effective. Less pretty tho. ($3 each for the 9211+ or 9332+)

IQAir has remarkable products, too, and they're around $7 (when buying 10) or... $5 (when buying 100).

Ref

3M Aura 9332+ (1 Mask) - https://www.amazon.com/dp/B013UKCUAO/

3M Aura  9211+  10/Pack - https://www.amazon.com/dp/B00AEXIS4S

Vogmask - https://www.amazon.com/stores/Vogmask/Homepage/page/4128603B-4DBB-4C86-9C93-F0B43AA3C704

Cambridge Mask Co https://www.amazon.com/stores/CambridgeMaskCo/CambridgeMaskCo/page/080FC542-D02F-4FAA-92CE-438238299EB5

IQAir [Mask] Respirator - https://www.amazon.com/dp/B07TMV2QT9/