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Ive made masks of 4 layers (2 cotton layers for the outside envelope and two inner salt coated filter layers), and they are as breathable as surgeon masks while being more comfortable to wear thanks to the larger air space in front of the nose and mouth. Merv 13 is more expensive, difficult to find, and may not be so breathable.

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4. Dust Masks activated Carbon Cotton Filter membranes adopts PM2.5 filter, it effectively blocks 99.997% of air pathogens (bacteria & viruses that cause illness), block allergens, pollen and air contaminants down to 0.1 microns, and reduce moisture loss by 88%.

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These masks are made of High quality filter media which blocks PM2.5 dust, haze, bacteria, influenza viruses etc. The 3 layer filter media increases effective filtration time by 50 percent, compared to similar products. These masks have a filtration capacity ranging from 80% to 95% depending upon the certification standard like FFP1/N95/KN95 etc.

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17 Top China Packing List Items 2020 + What to Wear &

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Seasonal aerosol variations over a coastal city, Zhoushan

Similarly, the polluted continental aerosol layers were mostly observed (with LAOD <0.5) during summer and autumn seasons with relative frequencies of about ~53% and ~31%, respectively (the numbers are obtained with the same aforesaid procedure) from the total observations (Fig. 4c and d), whereas, the dust aerosol layers were mostly observed

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