PM2.5 FACE MASK DISPOSABLE FILTERS 10pk so a mask should be
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PM2.5 FACE MASK DISPOSABLE FILTERS 10pk so a mask should beOur PM2. 5 filter is a 5 layer activated carbon filter that can be inserted in the side pocket of our Ugly Duckling Face Mask to improve the filtering performance. PM2. 5 refers to particles that have diameter less than 2. 5 micrometres (more than 100 times thinner than a human hair) and remain suspended for longer. These particles are formed as a result of burning fuel and chemical reactions that take place in the atmosphere. Filters can be effective
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