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air pollution(18)
nitrogen oxides(11)
ammonia(8)
nox(8)
air quality(7)
particulate matter(7)
so2(7)
nh3(6)
pollutants(6)
air pollutant emissions(5)
sulphur dioxide(5)
carbon monoxide(4)
ozone(4)
pm2.5(4)
acidification(3)
benzene(3)
census(3)
energy production(3)
humidity(3)
national emission ceilings directive(3)
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