Hygienic masks

Medical/anti-infectious masks



This is not necessarily the same thing as particulate masks, at least as far as priorities. Obviously some masks filter both well, but the priorities may differ. For example, particulate masks have a release valve, which AFAICT is not ideal for protecting other people from me if I wear it., although of course, protecting yourself from disease with a mask is not valueless to others in that you cannot transmit a disease you do not have.

Jeremy Howard, Cloth masks can protect the wearer:

As we all know now, the science shows that DIY masks are particularly good at protecting those around you in case you’re infected with COVID-19. But that does’t mean that you ca’t do a lot to protect yourself too.

Unfortunately, many public health bodies still incorrectly claim that there is no evidence that DIY masks are useful at protecting the wearer. There’s actually plenty of evidence they can. Effective protection for the wearer of a mask depends on three critical things:

  • Material: does the mask filter particles of the appropriate sizes?
  • Fit: do particles squeeze in through the gaps of your mask?
  • Sanitation: can you clean and re-use the mask?

Much more useful summary and advice there, now published (Brooks 2021).

Fixthemask has some bonus hacks, including useing a rubber band to keep masks snug. If you do’t want to hunt for weird filter types on ebay, there is the smart air guide which ranks normal fabrics and household filters.

How to Double Mask Correctly covers double masking, the latest, low-lift version of mask upgrades.

Enough practicalities! Here, have some silly fashion! Facemasks of your face. Glowing masks that are fiber optic!

Why so much confusion around masks? Probably several reasons, but here is an interesting one: The 60-Year-Old Scientific Screwup That Helped Covid Kill documents the argument and confusion about what size particles can transmit viruses and the lineage of some cargo-cult science that helped the misunderstandings take too long to settle.

Vendors for masks? Many on etsy. Slightly more professional-looking, uglier ones at Top Masks. See also particulate mask vendors.

Particulate masks

i.e. against pollution. See particulate masks.

References

Arpino, Fausto, Giorgio Grossi, Gino Cortellessa, Alex Mikszewski, Lidia Morawska, Giorgio Buonanno, and Luca Stabile. 2022. Risk of SARS-CoV-2 in a Car Cabin Assessed Through 3D CFD Simulations.” Indoor Air 32 (3): e13012.
Brooks, John T. 2021. Maximizing Fit for Cloth and Medical Procedure Masks to Improve Performance and Reduce SARS-CoV-2 Transmission and Exposure, 2021.” MMWR. Morbidity and Mortality Weekly Report 70.
Randall, K., E. T. Ewing, L. C. Marr, J. L. Jimenez, and L. Bourouiba. 2021. How Did We Get Here: What Are Droplets and Aerosols and How Far Do They Go? A Historical Perspective on the Transmission of Respiratory Infectious Diseases.” Interface Focus 11 (6): 20210049.
Wang, Chia C., Kimberly A. Prather, Josué Sznitman, Jose L. Jimenez, Seema S. Lakdawala, Zeynep Tufekci, and Linsey C. Marr. 2021. Airborne Transmission of Respiratory Viruses.” Science 373 (6558): eabd9149.
Wang, Wensi, Feng Wang, Dayi Lai, and Qingyan Chen. 2022. Evaluation of SARS-COV-2 Transmission and Infection in Airliner Cabins.” Indoor Air 32 (1): e12979.

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