Air pollution reduction during China's 11th Five-Year Plan period—local implementation and achievements in Shanxi province Zhang, Daisheng, Aunan, Kristin, Seip, Hans Martin, Larssen, Thorjørn, Vennemo, Haakon, Larssen, Steinar, Feng, Liulei, Wu, Caixia, Xie, Ruikai (2012-10)