above
aerial
air
alumina
aluminium
aluminum
atmosphere
bauxite
chimney
climate
construction
cooling
danger
dioxide
dirty
ecology
economics
economy
emissions
energy
environment
environmental
exhaust
factory
industrial
industry
metal
mineral
ore
pipe
piping
plant
pollution
processing
product
production
refinery
refining
smog
smoke
stack
steam
technology
tower
toxic
urban
vapor
warming