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air quality(96)
emissions(33)
particulate matter(27)
particulates(12)
carbon(10)
humidity(10)
nitrogen(10)
public health(9)
population(8)
carbon monoxide(7)
nitrogen dioxide(7)
aerosols(5)
natural gas(5)
urban areas(5)
volatile organic compounds(5)
agriculture(4)
heavy metals(4)
metals(4)
mortality(4)
nitrogen oxides(4)
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