PM2.5 particles causing health risk
PM2.5 air pollution in China is a very serious issue. The China Environmental Science Research Institute has been monitoring atmospheric PM 2.5 (Fine particles with a diameter of 2.5 μm or less ) at urban areas in China, monitoring big cities e.g. Beijing and Guangzhou. The measurement showed that the PM 2.5 concentration exceeded 100 µg/m3 while the official daily limit is 35 µg/m3. According to China Environmental Monitoring Station research, the PM2.5 pollution levels of Guangzhou, Wuhan, Lanzhou, Chongqing exceeds the new US limit 2-8 times.