air
atmosphere
carbon
chemical
chimney
climate
cloud
construction
contamination
danger
dioxide
dirty
ecological
ecology
emission
energy
environment
environmental
exhaust
factory
fuel
fume
fumes
generation
global
growth
harmful
industrial
industry
manufacturing
ozone
pipe
plant
pollute
pollution
power
production
refinery
sky
smog
smoke
smokestack
stack
station
steam
tower
toxic
warming
waste
white