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nitrogen oxides(15)
ammonia(12)
nox(11)
particulate matter(10)
so2(10)
nh3(9)
sulphur dioxide(9)
air pollution(8)
carbon monoxide(7)
non-methane volatile organic compounds(6)
air pollutant emissions(5)
air quality(5)
national emission ceilings directive(5)
nec directive(5)
nitrogen dioxide(5)
pm2.5(5)
sox(5)
benzene(4)
co(4)
energy production(4)
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