environmental
acid
air
atmosphere
black
chimney
climate
cloud
coal
damage
dark
demolish
dioxide
dirty
ecological
ecology
emissions
environment
exhaust
factory
fog
fuel
fumes
gas
global
grey
harmful
industrial
industry
intoxication
isolated
mystery
noxious
pipe
poison
poisoning
polluted air
pollution
power
sky
smog
smoke
smokestack
stack
steam
substance
tower
toxic
warming
white