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ammonia(52)
nitrogen(28)
nitrogen oxides(12)
carbon(11)
emissions(10)
oxygen(9)
particulate matter(6)
sulfur(6)
surface water(6)
volatile organic compounds(6)
water quality(6)
fertilizers(5)
lakes(5)
lead(5)
agriculture(4)
carbon monoxide(4)
nitrate(4)
absorption(3)
carbon dioxide(3)
density(3)
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