burner
catalyst
catalytic
chemical
chimney
complex
cooling
corporate
distill
dusk
electricity
emission
energy
engine
environment
environmental
factory
field
fuel
gas
gasoline
grass
industrial
industry
landscape
manufacturing
nature
nuclear
petrochemical
plant
pollute
pollution
power
process
production
site
sky
smog
smoke
station
steam
structure
technology
tower
vapor
wheat