If you don't have $ for a HEPA unit and/or you need something small you can take places as our society continues to be in denial about public health needs, you can build a Corsi-Rosenthal box small enough to take with you to a motel, the dentist office, etc.
https://www.texairfilters.com/a-mini-corsi-rosenthal-box-air-cleaner/ #CovidIsNotOver #PublicHealth
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