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particulate matter(11)
emissions(9)
air quality(7)
nitrogen(7)
carbon(5)
nitrogen oxides(5)
ammonia(3)
carbon monoxide(3)
nitrogen dioxide(3)
eutrophication(2)
heavy metals(2)
metals(2)
carbon dioxide(1)
hydrocarbons(1)
infrastructure(1)
iron(1)
lead(1)
natural gas(1)
public health(1)
sulfur(1)
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