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nitrogen oxides(19)
nox(14)
nitrous oxide(13)
ammonia(12)
nh3(10)
air pollution(9)
so2(9)
non-methane volatile organic compounds(6)
particulate matter(6)
pm2.5(6)
sulphur dioxide(6)
carbon dioxide(5)
national emission ceilings directive(5)
nec directive(5)
ozone(5)
sox(5)
climate change(4)
energy production(4)
methane(4)
nitrate(4)
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