“十三五”期间射阳县环境空气质量状况特征分析

Analysis on the Characteristics of Ambient Air Quality in Sheyang County during the "13th Five-Year Plan" Period

本研究采用2016-2020年射阳县环境空气质量监测数据,从空气质量优良率、主要污染物浓度变化、污染日的首要污染物分析空气质量状况及特征。结果表明,2016-2020年射阳县环境空气质量优良率逐年上升,整体优良率由高到低依次为秋季>夏季>春季>冬季。主要污染物浓度基本逐年下降,但臭氧浓度从2019年开始呈缓慢上升趋势。PM_(2.5)、PM_(10)、SO_(2)、NO_(2)、CO逐月变化规律基本一致,大致呈U形,两边高,中间低,O_(3)则正好与之相反。2016-2018年ρ(PM_(2.5))/ρ(PM_(10))呈逐年上升趋势,2019年开始缓慢下降,表明变化趋势是由二次颗粒物(PM)贡献较大向扬尘源贡献较大转变。ρ(NO_(2))/ρ(SO_(2))逐年升高,表明大气污染类型从燃煤型污染转变为复合型污染。污染日的首要污染物基本以PM_(2.5)和O_(3)为主,首要污染物为PM_(2.5)的天数基本出现在1-3月和10-12月2个时间段,首要污染物为O_(3)的天数基本出现在4-9月。

This study uses the ambient air quality monitoring data in Sheyang County from 2016 to 2020,and analyzes the air quality status and characteristics from the air quality rate,the concentration of major pollutants and the primary pollutants on pollution days.The results show that from 2016 to 2020,the excellent rate of ambient air quality in Sheyang County has increased year by year,and the overall excellent rate from high to low is autumn>summer>spring>winter.The concentration of major pollutants has basically decreased year by year,but the ozone concentration has shown a slow upward trend since 2019.The monthly changes of PM_(2.5),PM_(10),SO_(2),NO_(2) and CO are basically the same,roughly U-shaped,with high on both sides and low in the middle,while O_(3) is just the opposite.From 2016 to 2018,ρ(PM_(2.5))/ρ(PM_(10))showed an upward trend year by year,and began to decrease slowly in 2019,indicating that the change trend is from a larger contribution of secondary particulate matter(PM)to a larger contribution of dust sources.ρ(NO_(2))/ρ(SO_(2))increases year by year,indicating that the type of air pollution has changed from coal-burning pollution to compound pollution.The main pollutants on pollution days are basically PM_(2.5) and O_(3),and the number of days when the primary pollutant is PM_(2.5) basically occurs in the two time periods from January to March and from October to December,and the number of days when the primary pollutant is O_(3) basically occurs from April to September.