2016—2018年中卫市城区大气污染特征分析

Characteristics Analysis of Air Pollution in Zhongwei City from 2016 to 2018

利用2016年1月至2018年12月中卫市城区空气质量资料,对中卫市城区空气质量、大气污染物质量浓度特征进行分析。结果表明,2016—2018年,中卫市城区空气质量相对较好,污染天气日数为74~94 d,尤以轻度污染为主。城区秋季空气质量良好,冬春空气污染较为严重。环保局站和官桥站的首要污染物主要是PM10,其次为臭氧。没有CO和NO2为首要污染物的情况发生。官桥站、环保局站PM2.5、PM10年平均质量浓度超标,前者数值略高于后者。2个监测点臭氧8 h季节平均质量浓度为倒V形,峰值主要出现在夏季。2个监测点臭氧8 h月平均质量浓度峰值主要出现在5—9月份,呈现双峰或单峰结构。其他5类污染物季节、月平均质量浓度变化趋势呈现与臭氧8 h浓度相反的特点。

Based on the air quality data of Zhongwei city from January 2016 to December 2018,the characteristics of the air quality and the concentration of air pollutants are analyzed.The results show that from 2016 to 2018,the urban air quality is relatively good,with 74 to 94 days of polluted weather,which mainly is regarded as the light pollution.The air quality in the urban area is good in autumn,and air pollution is more serious in winter and spring.The primary pollutant in the environmental protection agency and Guanqiao station is mainly PM10,followed by ozone.The primary pollutants of CO and NO2 hasn’t occurred.The annual average mass concentration of PM2.5 and PM10 exceeds the standard,with the former being slightly higher than the latter.The seasonal average concentration of O38 h in the two monitoring sites is inverted V type,with the peak value appearing mainly in summer.The monthly average concentration of O38h shows a double-peak or single-peak structure from May to September.The other five pollutants show the opposite characteristics.