Despite the best efforts of the local government and its people to improve the environment, unfortunately Lanzhou remains one of the 10 most polluted cities in the world.
Lanzhou is situated in a valley and in addition to vehicle emissions, heavy industrial emissions, and very dry conditions which compound the problem, a lot of construction work is undertaken within the city. Coal is also the main source of fuel. The local government first started to work on air pollution projects in the 1980's. I took these two photos this afternoon to show how construction work in the city can affect the air quality.
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