acid
air
architecture
atmosphere
background
business
chemical
chemistry
chimney
climate
cloud
co2
contamination
danger
dirty
ecology
effect
emissions
energy
engineering
environment
environmental
equipment
factory
fuel
fumes
gas
global
greenhouse
health
heavy
icon
industrial
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manufacturing
petrochemical
petroleum
pipe
plant
pollution
rain
refinery
sky
smog
smoke
solar
standard
toxic
vapor
warming
定額
White smoke comes from pipes against blue sky. Problem harmful emissions and air pollution of central heating population of large cities eco conceptの素材 [FY310131227988]
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