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While we're talking about numbers...great progress in lowering the outdoor air pollution limit for PM2.5 from 12 ug/m3 to 9 ug/m3. Do you know what the legally enforceable limit is for *indoor* particles? Have a listen.

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Joseph Allen

48,826 subscribers

11,138 просмотров • 2 лет назад •via X (Twitter)

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Фото профиля Scott Farbman
Scott Farbman2 лет назад

We’ve been monitoring pm2.5 in our backyard and let me tell you something …

Фото профиля Don Osborn
Don Osborn2 лет назад

5000 ug/m3

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