This might work for particulates, but I doubt it would do anything for other types of air pollution like ozone. It kind of reminds me of the old idea in Southern California of digging tunnels in the mountains and building giant fans to blow the smog out over the Pacific Ocean.
Most of the air pollution in China, and really most of Industrial Asia, is particulate. If they can find a legitimate powersource, this might be a viable short-term solution.