acid
air
asthmatic
atmosphere
breathe
chemical
chimney
climate
cloud
coal
condensation
construction
dioxide
dirty
ecological
ecology
emissions
energy
environment
factory
fuel
fumes
gas
global
high
industrial
industry
nuclear
ozone
pipe
poison
poisoning
pollution
power
precipitation
red
refinery
sky
smog
smoke
stack
station
steam
substance
technology
tower
toxic
warming
waste
white