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  Sheila Kaplan, The New York Times  Published: 17 Dec 2020 10:12 AM BdST Updated: 17 Dec 2020 10:12 AM BdST FILE A wide variety of face masks, some with sports team logos, at a store in Cypress, Texas, on Nov 27, 2020. New filtration standards being developed aim to help consumers understand just how effective the masks they buy really are. (Go Nakamura/The New York Times) More than 100,000 varieties of face masks are currently for sale. They come in silk, cotton and synthetics; with filters and without; over-the-head and over-the-ears. They have sparkles and sunflowers; friendly greetings and insults; cartoon characters and teeny reindeer. ); } What they don’t have is a label that shows how well they block infectious particles, an omission that has frustrated public health officials during the coronavirus pandemic. Those experts note that there is a big range in the effectiveness of various designs, and some barely filter out particles at all.

New yorkUnited statesLinsey marrFran phillipsDiana zuckermanMaryann dalessandroJeffrey stullDale pfriemNational institute for occupational safetyCenters for diseaseInternational personnel protection incNational centerYork times companyDrug administrationNational personal protective technology laboratoryEquipment consulting services