environmental
air
asia
asian
atmosphere
blue
chemical
chimney
city
cityscape
dioxide
dirty
ecology
emissions
energetics
energy
environment
factory
field
freight
fuel
gas
global
high
industrial
industry
japan
japanese
kawasaki
large
lines
metal
petroleum
pipe
plant
pollution
power
sky
smog
smoke
snow
steam
technology
thermal
tokyo
train
tubing
white
winter