air
air pollution
building
carbon dioxide
chemical
chemical plant
chimney
cloud
clouds
coking
coking plant
dark
duisburg
energy
environmental damage
factory
flare stack
fossil fuel
germany
global business
global warming
hill
illuminated
industrial
industrial building
industry
light
night
oil industry
oil refinery
panorama
panoramic
petrochemical plant
plant
pollution
refinery
reflection
rhine
rhine river
river
ruhr area
ruhrgebiet
shiny
sky
skyline
smoke stack
steam
steaming
tall
tower
water