air
atmosphere
belching
big
blue
building
carbon
chemical
chimney
climate
coal
dioxide
ecology
electricity
emission
energy
environment
exhaust
factory
fuel
fume
gas
generation
global
high
industrial
industry
landscape
manufacturing
plant
pollute
pollution
power
red
refinery
sky
smog
smoke
smokestack
stack
station
steam
tall
technology
tower
toxic
vapor
warming
waste
white