平凉市霾沙尘等重污染天气特征分析

Analysis of weather characteristics of heavy pollution such as haze, sand and dust in Pingliang City

通过分析近49年平凉市霾、沙尘天气得出,主要污染因素是浮尘、扬沙,其次是霾和沙尘暴,其中崆峒、泾川霾、沙尘天气最多,静宁、灵台最少;霾主要发生在冬季,以1、2月最多,春季沙尘天气多发,4月最多;20世纪70年代开始霾、沙尘天气减少,因庄浪修建梯田,20世纪70年代沙尘天气增多,90年代达最多,后开始减少。应继续加强退耕还林还草等国家重点工程建设,延缓沙漠化进程,保护生态环境。

By analyzing the haze and dust weather in Pingliang city in recent 49 years,it is concluded that the main pollution factors are floating dust and sand,followed by haze and sandstorm,among which Kongtong,Jingchuan haze and dust weather is the most,Jingning,Lingtai least;Haze mainly occurs in winter,with the most in January and February,more sandstorms in spring,and the most in April.Since the 1970s,the haze and dust weather decreased.Due to the construction of terraced fields in zhuanglang,the dust weather increased in the 1970s,peaked in the 1990s,and then began to decrease.We should continue to strengthen key national projects such as returning farmland to forests and grasslands,slow down the process of desertification,and protect the ecological environment.