air pollution
architecture
artificial
basic
blue
brick
building
chimney
city
durable
ecology
edge
energy
environment
exit
factory
fuel
gas
gigantic
heat
high
higher
history
huge
industrial
industry
long
manufactory
manufacture
material
old
pipe
plant
pollution
power
production
productivity
sky
smog
smoke
smokestack
station
steam
straight
strong
structure
tall
technology
wall
window