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