2017~2020年临汾市空气质量特征分析及评价

Analysis and evaluation of air quality characteristics in Linfen Cityfrom 2017 to 2020

以临汾市为研究区域,基于2017~2020年空气质量逐日数据,对研究区AQI和首要污染物的年季变化特征进行分析,采用综合污染指数法对空气质量进行了评价。结果表明:2017~2020年,空气质量为优良的天数呈逐年增加趋势,而轻度污染及以上等级的天数呈逐年减少趋势;煤炭能源总量消耗,私家车保有量,绿化覆盖率,第二产业占比和工业粉尘排放等因素影响了污染物的排放;空气质量总体上呈现“夏好冬差,春秋居中”的规律;秋冬季节的首要污染物主要为PM_(2.5),夏季的首要污染物主要为O_(3);空气质量综合指数优良排序依次为2020年、2019年、2018年和2017年;2017和2018年的空气质量等级为中度污染,2019和2020年的空气质量等级为轻度污染,空气质量有所改善,但需要继续加强治理。

The annual and seasonal variation characteristics of AQI and primary pollutants in Linfen City were analyzed based on the daily air quality data from 2017 to 2020.The air quality was evaluated using comprehensive pollution index method.The results show that,from 2017 to 2020,the number of days with good air quality is increasing year by year,while the number of days with light pollution and above is decreasing year by year.The emission of pollutants is affected by the total consumption of coal energy,private car ownership,green coverage,the proportion of the secondary industry and industrial dust emissions.The air quality is good in summer,bad in winter and general in spring and autumn.PM_(2.5) is the main pollutant in autumn and winter,and O_(3)is the main pollutant in summer.The years ranked from good air quality composite index to bad are 2020,2019,2018 and 2017.The air quality level of Linfen city is moderate pollution in 2017 and 2018,and is slight pollution in 2019 and 2020.The air quality has improved,but it still needs further control and treatment.