Bryan Johnson· Author
In a study in Delhi, M50 facemasks were found to reduce short-term mortality linked to air pollution by 49%, followed by M49, and M48 at 37% and 29% mortality reduction (10).
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
In a study in Delhi, M50 facemasks were found to reduce short-term mortality linked to air pollution by 49%, followed by M49, and M48 at 37% and 29% mortality reduction (10).
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there was interesting data that those who wore an M50 mask we're able to reduce the mortality linked air pollution by 49% an m49 mask by 37% and M48 by 29%