blue
chemical
chemistry
chimney
city
clear
construction
dark
diesel
distillation
distillery
ecology
energy
engineering
environment
factory
gas
industrial
industry
japan
japanese
kawasaki
line
manufacture
metal
night
oil
outdoor
outside
petrochemical
petrol
petroleum
pipe
pipeline
plant
pollution
power
production
protection
refinery
scene
sky
smoke
stack
station
supply
system
technology
tower
tube