air
blue
catalytic
chemical
chimney
cooling
corporation
dirty
employment
energy
engineer
environmental
equipment
exchanger
exhaust
factory
fumes
furnace
gas
gasoline
health
heat
heavy
industrial
industry
kyoto
manufacture
manufacturing
modern
new
oil
pipe
power
process
quality
refinery
resource
sky
smoke
stack
steam
tank
tower
train
unit
vapor
vapour
work