What are the causes of air pollution in Beijing?

Hi guys, I was wondering if anyone could give me some in depth Information about the causes of air pollution in Beijing. I know the causes are: traffic (Cars,buses), Construction, Burning of fossil fuels, dust storms, Factories and the mountains but do you have any good in depth information or websites,, please... show more Hi guys, I was wondering if anyone could give me some in depth Information about the causes of air pollution in Beijing. I know the causes are: traffic (Cars,buses), Construction, Burning of fossil fuels, dust storms, Factories and the mountains

but do you have any good in depth information or websites,, please please help me

thankyou so much
Update: Does anyone have any good statistics or really good websites?
Update 2: Hi JBQS, i was just wondering where you got your information from so i could look further into it?
Thanks
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