environmental
air
air pollution
atmosphere
carbon
chemical
chemical smoke
chemistry
chimney
climate
climate change
copy space
destructive
eco
ecological
ecology
electricity
emission
energy
environment
factory
fume
fumes
gas
global
global warming
greenhouse effect
heating
industrial
industry
manufacturing
ozone layer
pipe
plant
poison
pollution
refinery
sky
smog
smoke
smoke fumes
smokestack
stack
steam
sulfur
toxic
warming
yellow air
yellow sky