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road transport(9)
transport(6)
emissions from transport(4)
freight transport(4)
rail(4)
air pollution(3)
air quality(3)
particulate matter(3)
passenger transport(3)
sox(3)
transport demand(3)
air transport(2)
ammonia(2)
aviation(2)
car ownership(2)
climate change(2)
co2(2)
emissions(2)
energy production(2)
health impacts(2)
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