acid
air
blue
breathe
changing
chemical
chimney
climate
construction
deleterious
demolish
dioxide
dirty
ecology
emissions
environment
environmental
exhaust
factory
fuel
fumes
gas
global
heat
heating
industrial
industry
intoxication
nature
nuclear
pipe
plant
poison
pollution
power
refinery
sky
smog
smoke
smokecloud
stack
station
steam
technology
tower
toxic
trail
up
warming
white