environmental
burner
catalytic
chemical
chimney
complex
corporate
corporation
dark
distill
dusk
ecology
emission
energy
factory
fuel
fume
gas
gasoline
heavy
industrial
industry
landscape
light
manufacturing
metal
night
oil
petrochemical
petroleum
pipe
plant
port
power
process
production
refinery
reflection
site
sky
smog
smoke
steam
steel
structure
tank
technology
tower
vapor
water