Supported by the National Natural Science Foundation of China (Grant Nos. 40571147, 40401064, 90502008 and 40421101);the International Collaboration Project of Chinese Ministry of Science and Technology (Grant No. 2002CB714004)
Urban particulate pollutants not only affect urban air quality but also directly threaten public health. Lanzhou has been one of the most seriously polluted cities in the world due to its special geophysical location ...