acid
atmosphere
billowing
building
carbon
chemical
chimney
climate
cloud
contamination
crisis
danger
dioxide
dirty
ecology
environment
environmental
exhaust
factory
gas
global
greenhouse
harmful
hazard
hazardous
industrial
industry
manufacturing
ozone
plant
poison
pollute
pollution
power
red
saturated
smog
smoke
smokestack
stack
station
steam
tower
toxic
vapor
warming
waste