air pollution
business finance and industry
carbon dioxide
chemical
chimney
climate
climate change
cloud sky
color image
condensation
danger
dioxin
dirty
dramatic sky
emitting
environment
environmental damage
environmental issues
factory
fuel and power generation
fumes
global
greenhouse gas
horizontal
industry
mineral
nature
netherlands
no people
ozone layer
photography
pipe tube
plant
poisonous
pollution
power station
refinery
sky
smog
smoke physical structure
smoke stack
social issues
steam
technology
tower
unhygienic
weather
wind