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Surgical Masks Surprisingly Effective Against PM2.5

The left most mask is a 3M N95 mask, the N95 mask2 is a Moldex N95, and the right most mask is a cheap surgical mask bought from a street vendor in Kathmandu. The surgical mask blocked about 60% of .03 micron particles and over 90% of 1 micron and 2.5 micron particles.

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Can masks really filter the particulate matter as small as

For the readers not familiar with particles size, PM 10 refers to particles smaller than 10 micrometer, and for PM 2.5, it refers to smaller than 2.5 micrometers. So, filtering out all the particulates smaller than " 0.1 microns (same as 0.1 micrometers )", means that it can filter particles 25 times smaller than the harmful PM 2.5! So, no

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5.5 ISO CertificationIn addition to the above tests, all medical face masks must be tested to an international standard (ISO 10993 5, 10) for skin sensitivity and cytotoxic tests to ensure that no materials are harmful to the wearer. Tests are conducted on materials used in construction of the mask which come in contact with the user's skin.