active
air
architecture
blue
boiler
brick
business
chemical
chimney
clear
climate
construction
disaster
ecology
energy
environment
environmental
exterior
factory
fuel
fume
fuming
funnel
gas
heat
industrial
industry
manufacturing
old
pipe
piping
plant
pollution
power
problem
production
red
refinery
sky
smoke
steam
tower
tube
tubing
vapor
warming
white
work