air
asthmatic
atmosphere
breathe
changing
chimney
climate
cloud
coal
damage
demolish
dioxide
dirty
ecological
ecologically
ecology
emissions
factory
fuel
fumes
gas
global
growth
harmful
health
industrial
industry
noxious
ozone
pipe
poison
poisoning
pollution
power
precipitation
sky
smog
smoke
stack
station
steam
substance
tower
warming
white