74 Chinese cities release real-time PM2.5 data (1/2)

A map showing PM2.5 intensity in China's 74 major cities is displayed at the website of China National Environmental Monitoring Center (CNEMC), Jan. 2, 2013. Starting from Tuesday, real-time air quality monitoring data on PM2.5 intensity and other air quality information in China's 74 major cities can be available at the website. (Xinhua/Gong Lei)