PM 2.5 seems to be like radiation: the more you get, the more you're likely to be affected, even at lowish levels. https://qz.com/1166010/air-pollution-even-at

PM 2.5 seems to be like radiation: the more you get, the more you're likely to be affected, even at lowish levels. https://qz.com/1166010/air-pollution-even-at-levels-that-meet-national-standards-causes-premature-death/ https://qz.com/1166010/air-pollution-even-at-levels-that-mee...