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air quality(60)
emissions(49)
particulate matter(38)
carbon(27)
nitrogen(24)
humidity(21)
particulates(19)
atmosphere(17)
nitrogen oxides(14)
public health(14)
carbon monoxide(11)
nitrogen dioxide(10)
sulfur(10)
aerosols(9)
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urban areas(9)
atmospheric chemistry(8)
mortality(7)
volatile organic compounds(7)
heat(5)
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