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emissions(33)
air quality(14)
nitrogen(12)
nitrogen oxides(10)
particulate matter(10)
carbon(9)
ammonia(7)
carbon monoxide(4)
heavy metals(3)
lead(3)
metals(3)
nitrogen dioxide(3)
sulfur(3)
sustainability(3)
volatile organic compounds(3)
agriculture(2)
electricity(2)
eutrophication(2)
hydrocarbons(2)
public health(2)
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