天津市交通环境监测点位空气质量特征

Characteristics of Air Quality of Traffic Environmental Monitoring Station in Tianjin

利用天津市2019年交通站与环境空气质量监测数据,分析了天津市交通环境监测站空气质量特征。结果表明,交通监测站PM2.5、PM10、NO2、CO、O3和SO2浓度分别为56、85、48、2700、191、9μg/m3,综合指数为6.03。与环境空气中站相比,交通站空气污染水平总体较高,综合指数比全市高10.0%,PM2.5高9.8%,NO2(比淮河道)高26.3%,CO高50.0%,交通站的NO2和CO对综合指数的贡献比例相对较高。交通站主要污染物逐月分布特征与日分布与环境空气站基本一致,交通站的NO2浓度在3—11月、PM2.5浓度在4—5月明显高于环境空气站,CO浓度整体较高,O3浓度整体较低,NO2、PM2.5和CO逐小时浓度水平明显高于环境空气站,而O3相对偏低。

The air quality characteristics of Tianjin traffic environmental monitoring stations were analyzed based on 2019 traffic and ambient air quality monitoring data.The results showed that the concentrations of PM2.5,PM10,NO2,CO,O3 and SO2 at the traffic monitoring station were 56,85,48,2700,191 and 9μg/m3 respectively,and the comprehensive index was 6.03.Compared with ambient air stations,the air pollution level of the traffic station was generally higher,the comprehensive index,PM2.5 and CO were 10.0%,9.8%and 50.0%higher than that of the whole city,and NO2 was 26.3%higher than that of Huaihe road.The contribution ratio of NO2 and CO at the traffic station to the comprehensive index was relatively higher.The monthly and daily distribution characteristics of pollutants at the traffic station were basically consistent with that at ambient air stations.The concentrations of NO2(from March to November)and PM2.5(from April to May)at the traffic station were significantly higher than those at ambient air stations.The CO at the traffic station was higher than that at ambient air stations,while the O3 was relatively lower.Hourly concentrations of NO2,PM2.5 and CO were significantly higher than those at ambient air stations,while O3 was relatively lower.