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emissions(31)
nitrogen(12)
air quality(11)
nitrogen oxides(10)
carbon(9)
particulate matter(9)
ammonia(7)
carbon monoxide(4)
nitrogen dioxide(3)
sustainability(3)
volatile organic compounds(3)
agriculture(2)
eutrophication(2)
heavy metals(2)
hydrocarbons(2)
lead(2)
metals(2)
public health(2)
sulfur(2)
carbon dioxide(1)
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