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hydrocarbons(26)
carbon(8)
ammonia(4)
degradation(4)
lead(4)
methane(4)
nitrogen(4)
petroleum(4)
atmosphere(3)
emissions(3)
nitrogen oxides(3)
organic carbon(3)
particulate matter(3)
aerosols(2)
atmospheric chemistry(2)
carbon dioxide(2)
gas hydrates(2)
geochemistry(2)
heavy metals(2)
metals(2)
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