air
atmosphere
carbon
chemical
chimney
cityscape
cleanliness
climate
cloud
contaminate
damage
dioxide
dirty
ecological
ecology
emission
energy
environment
environmental
exhaust
factory
fog
fuel
fume
industry
magnitogorsk
metallurgical
ozone
pipe
plant
poison
pollute
pollution
power
production
refinery
reflection
risk
russia
russian
sky
smog
smoke
smokestack
steam
technology
tower
toxic
ural
warming