20 Dec 2017 . Scientific tests find common pollution masks block over 99% of microscopic . The blue tube is sampling air outside the mask, while the white tube is . Respirators are great, but note that these are tests on particulate pollution such as PM2.5 . . Can Japanese Pitta masks protect against Coronavirus?
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Ordered dark blue but received black instead but acceptable. Slow delivery. Delivery time below expectation. 17-02-2020 08:37 Variation: Dark blue .
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5 Jun 2018 . The 2.5 in PM2.5 refers to the size of the pollutant in micrometers. . has responded forcefully, claiming to “make our skies blue again” by .
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