air
atmosphere
breathe
carbon
chemical
chimney
clouds
co2
contamination
corrupt
danger
dioxide
dirty
ecological
ecosystem
emission
energy
environment
environmental
exhaust
factory
fume
global
harmful
hazardous
industrial
industry
orange
ozone
pipe
plume
poison
pollute
polluting
pollution
power
production
sky
smog
smoke
smokestacks
stack
station
steam
tower
toxic
vapor
warming
white