Anyone who visits Beijing can't help but notice the intensity of the levels of traffic in the city, which parallel the toxic atmosphere that blankets it as well. Whilst it is unfair to blame Beijing's air primarily on road transport (Beijing did have many heavy industrial plants located there as part of a Maoist policy of glorifying such industry), it is clear that the excess demand for the available road space is not only strangling the city economically, but also contributing to its suffocation by pollution.
I've written before about the challenges in implementing congestion pricing in Beijing:
My view is that it can be done, but is probably best implemented on a zonal basis at this stage, with the key issue being able to enforce against number plates in a consistent, fair and well managed way.
China Radio International reports that "The Beijing Municipal Environmental Protection Bureau has announced that it will draw up policies related to a congestion charge in a newly issued document."