Air filter masks
Q's about 95, 99 masks: How long can we wear a mask, at a stretch? What are side effects of not wearing it properly? What are different ways in which mask is not worn correctly, or what is the correct ways of using the mask? How many days can a single mask be used? Can it be washed, if using thin cloth like mask? Would also be interested to know most effective mask available in NCR.
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