The 22nd IE Expo China kicked off at the Shanghai New International Expo Center in the Pudong New Area on Tuesday. Asia’s largest environmentally themed trade fair, organized by four institutes and companies including the Chinese Society for Environmental Sciences and the China Environment Chamber of Commerce, attracted nearly 2,200 exhibitors from home and aboard this year. The three-day exhibition features many cutting-edge environmental technologies, such as sewage disposal, solid-waste treatment and air pollution control in the 180,000-square-meter venue.