environmental
air
atmosphere
carbon
chemical
chimney
climate
cloud
coal
concept
concrete
damage
dark
dioxide
dirty
ecology
emission
emit
energy
environment
exhaust
factory
fog
fuel
fumes
gas
global
health
hot
industrial
industry
movement
ozone
pipe
pollution
polution
power
refinery
sky
smog
smoke
station
steam
substance
tower
toxic
vapor
warming
white