China’s worldly renowned pianist Lang Lang presents a concert for local citizens in Lanzhou at the Lanzhou Music Hall on September 7. During the concert, Lang is also conferred the title of Lanzhou International City Image Promotion Ambassador. Lanzhou has made great progress in air pollution control over the past years as it won the award for Today’s Transformative Step during the World Climate Change Conference in Paris last year. [Photo/Lanzhou.cn]