environmental
abstract
air
atmospheric
blue
carbon
chemical
chimney
climate
department
dioxide
ecology
effluent
emission
emissions
enterprise
environment
exhaust gas
factory
four
fugitive emission
fumes
funnel
horizontal
housetop
hydrocarbon
improvement
industrial
manufactory
manufacturing
midair
mill
plant
plate
pollutant emissions
pollution
red
roof
sky
smog
smoke
smokestack
stack sources
steam
striped
tax
two
venting
white
work