chemical
chimney
complex
diesel
dioxide
distill
distilling
economy
energy
environment
environmental
exhaust
factory
fuel
fumes
gas
gasoline
industrial
industry
manufacture
manufacturing
oil
petrol
petroleum
pipe
plant
pollution
power
processing
production
refine
refinery
refining
site
sky
smog
smokestack
smokestacks
stack
steam
technology
tower
toxic
tube
vapour
work