2015—2017年江苏省秋、冬季空气质量状况

采用2015—2017年秋、冬季江苏省环境空气质量监测数据,从空气质量优良(达标)率、首要污染物、主要污染物浓度分析空气质量现状及特点。结果表明,江苏省秋、冬季空气质量优良(达标)率在60%左右,其中沿海地区空气质量达标率最高(71.1%),西北地区达标率最差(52.2%)。污染日的首要污染物主要为PM 2.5,占比高达91.5%。ρ(PM2.5)/ρ(PM 10)存在地区差异,江苏西北地区扬尘源贡献较大,江苏南部地区的二次颗粒物贡献更明显。ρ(NO2)/ρ(SO2)逐年持续升高,表明大气污染类型从燃煤性污染转变为复合型污染。

Current Situation of Air Quality in Autumn and Winter in Jiangsu Province from 2015 to 2017

Based on the environmental air quality monitoring data of Jiangsu Province in the autumn and winter of 2015—2017,the excellent rate of air quality,primary pollutants and major pollutant concentrations were used to analyze the status and characteristics of air quality.The results showed that the excellent rate of air quality in autumn and winter in Jiangsu Province was around 60%,with the highest rate in coastal areas(71.1%)and the worst rate in northwest(52.2%).The primary pollutant on the pollution day was mainly PM 2.5,which accounted for 91.5%.There are regional differences in the ratio of ρ(PM2.5)/ρ(PM10),which indicates that the contribution of dust source in northwest Jiangsu is larger,and the contribution of secondary particulate matter in the southern region of Jiangsu Province is more obvious.The ratio ofρ(NO2)/ρ(SO2)continues to increase year by year,which indicates that the type of air pollution changes from coal-fired air pollution to complex air pollution.