This paper used wind direction and speed data collected at four anemometer towers (70 meters) from Qinchuan-Jinjiamao, Xicha-Duanjiachuan, Heishichuan-Heping and the southeast of Lanzhou New District, and other four high AWS (Automatic Weather Station) (10 meters) at the new district from January to December 2014, to analyze the area's prevailing wind direction, speed, characteristics and distributions of air pollution. The reselts showed:The new district exhibited complex geographic variations; Prevailing wind direction, speed, and air pollution index (API) changed depending on altitude, time, and location. During the period of 2014, the new district anemometer towers (70 meters) observed a dominant frequency of northeastern prevailing wind, a direction with the highest average wind speed; As for API, it was the lowest between Qinchuan-Jinjiamiao and Xicha-Duanjiachuan at the west by north, and the lowest API between the southeast of Lanzhou New District and Heishichuan-Heping is at the north and the near directions. Furthermore, the prevailing wind direction, speed and API had some differences between the 10 meters towers and the 70 meters towers. The wind fields also changed among the four towers. Calm wind weather occurred at each observation point. The Frequency for calm wind was 4. 2%~13. 5% at 70 meters, and 5. 6%~11. 6% at 10 meters; Each tower had distinct seasonal differences; Autumn and winter shared a similar prevailing wind direction, and spring and summer shared a similarity at another direction. The daily wind changes at the new district also displayed characteristics of valley wind, with a southeast or southwest prevailing wind in the day, and a northeast or east wind at night.
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