1. Charlie Thomson on

    Why choose choose 200 AQI as the cutoff for wearing a mask? I assume you mean US AQI which would mean at least 150 ug/m3 of PM2.5. That’s 6 times the WHO 24-hour exposure limit and 15 times higher than the WHO annual exposure guideline. I just wonder if what the rationale is for stating such a high cutoff.

    • Hi Charlie, thanks for your response. This article dates back to 2016, so I’ll have to ask Dr. Dexter if she’s available to comment on why she’s chosen that level as the cutoff.

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