兰州新区2017—2019年环境空气质量变化趋势研究

Research on the Change Trend of Ambient Air Qualityin Lanzhou New Area During 2017 to 2019

利用2017—2019年兰州新区环境空气自动监测数据,采用综合污染指数分析了兰州新区空气质量变化特征,并利用Pearson相关系数法分析了兰州新区环境空气质量指数(AQI)与污染物浓度之间的关系。结果表明:兰州新区近三年空气质量状况为2019年最好,2018年最差;AQI夏冬季较高,春秋季较低。近3年总污染负荷贡献率大小为PM10>PM2.5>O3>NO2>CO>SO2,PM10是兰州新区首要污染物。AQI与SO2、NO2、PM10、CO、O3和PM2.5浓度均呈现显著正相关关系(P<0.01),其中颗粒物对兰州新区环境空气质量影响最大。PM2.5、PM10、SO2、CO、NO2浓度之间均呈现显著正相关,O3与其余污染物之间均呈现显著负相关。

Based on the monitoring data from ambient air quality automatic monitoring station in Lanzhou New Area during 2017 to 2019,using comprehensive pollution index to analyze the changed characteristics of air quality in Lanzhou New Area,and the Pearson correlation coefficient method was also used to analyze the relationship between ambient air quality index(AQI)and pollutant concentration.The results showed that the air quality status in Lanzhou New Area was the best in 2019 and the worst in 2018;AQI was higher in summer and winter and lower in spring and autumn.In recent three years,the contribution rate of pollution load was PM10>PM2.5>O3>NO2>CO>SO2,and PM10 was the major pollutant in Lanzhou New Area.AQI showed a significant positive correlation with the concentrations of SO2,NO2,PM10,CO,O3 and PM2.5(P<0.01),and particulate matter had the greatest impact on the ambient air quality.The concentrations of PM2.5,PM10,SO2,CO and NO2 showed significant positive correlation with each other,on the contrary,O3 showed a significant negative correlation with other pollutants.