burner
catalyst
catalytic
chemical
chimney
complex
corporate
corporation
distill
dusk
electricity
emission
energy
engine
environment
environmental
factory
fuel
gas
gasoline
global
industrial
industry
kyoto
landscape
manufacturing
nature
oil
petrochemical
petroleum
plant
pollute
pollution
port
power
process
production
river
site
sky
smog
smoke
station
steam
structure
technology
vapor