atmosphere
blue
chimney
cloud
combustion
condensation
dispersion
draft
emission
exhaust
factory
fire
flue
fume
funnel
furnace
gas
gases
gray
heat
height
industrial
industry
industrysteam
matter
particulate
pipe
plant
pollutant
power
sky
smoke
soot
stack
structure
tall
tower
toxic
vapor
ventilation
vertical
water
white