The 3 best apps to monitor air pollution

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  • kylekun Seattle, WA
    Feb. 9, 2019 4:56 p.m.

    Puraka Clean Air Research just published an incredibly helpful calculator that shows the air quality when you mix different respirator filters and fits. One of the things it demonstrates is what I've been talking about a lot lately: how well a mask fits matters much more than what kind of filter you use.