environmental
air
area
atmosphere
building
business
chemical
chimney
climate
cloud
contamination
danger
dioxide
dirty
ecology
emission
environment
factory
fuel
fume
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gas
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industrial
industry
landscape
manufacturing
nuclear
oil
petrochemical
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pollute
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power
production
refinery
risk
sky
smog
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smokestack
stack
steam
technology
toxic
tube
vapor
waste