Feb 28, 2020 · The filtration effects can last long by its special design, usually recommend replacing the filter once a week. Applications:To use with mask for anti-dust, anti-vehicle exhaust, anti PM2.5 and haze day protection. It is suitable for cycling, running,
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Special Design:Adjustable nose clip, High elastic soft ear hook, Three-level height adjustable mask. 2.0 out of 5 stars Value not worth the high price. Reviewed in the United States on January 27, 2020. I am not sure how much protection it provides. I may have to wear 2 for better protection. I guess you get what you paid for. Read
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The data include two mask indices:total mask index and anti-PM 2.5 mask index. The total mask index measures the aggregated purchases of all kinds of facemasks in a city during each day. The anti-PM 2.5 mask index only includes the purchase record of those facemasks labeled specifically as anti-PM 2.5.
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