air
atmosphere
background
chimney
city
clean
close
cloudless
concrete
conditions
damage
dark
day
deleterious
detriment
detrimental
ecology
effects
ejection
emissions
enterprise
environment
exhaust
factory
free space
gases
harmful
high
industrial
industry
landscape
manufacturing
nature
pipe
plant
poisoning
pollution
sky
smog
smoke
steam
thick
trumpet
white
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