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Nov 27, 2015 The 2.5 in PM 2.5 refers to the size of the pollutant in micrometers. Additionally, particulate pollutants vary in size and the smaller they are, the more damage they cause to your health. PM10 is particulates that have a diameter of 10 micrometers or less. Dust particles are the main source of PM10. PM2.5 is comparatively much smaller in

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A wide variety of activated carbon respirator options are available to you, There are 349 suppliers who sells activated carbon respirator on , mainly located in Asia. The top countries of suppliers are China, India, and Thailand, from which the percentage of activated carbon respirator supply is 97%, 1%, and 1% respectively.

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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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