acid
air
architecture
atmosphere
building
chemical
chimney
climate
cloud
coal
dioxide
dirty
earth
ecological
ecology
emissions
energy
environment
environmental
factory
fuel
fumes
gas
global
health
hot
industrial
industry
orange
ozone
pipe
plant
poison
pollution
power
production
sky
smog
smoke
stack
station
steam
steel
technology
tower
toxic
vapor
warming
waste
white