青年奥林匹克运动会期间南京市主要大气污染物浓度变化与分析

Variation and analysis of air pollutants concentration in Nanjing during the Youth Olympic Games

为了解青年奥林匹克运动会期间南京市主要大气污染物浓度变化趋势,通过南京空气质量发布系统实时监测的数据,对青奥会举办前(2014年8月3日—16日)、举办期间(2014年8月17日—28日)以及举办之后(2014年8月29日—9月9日)南京市主要大气污染物浓度变化特征进行比较分析,结果表明,青奥会前的14 d南京市PM2.5、PM10、SO2、NO2、O3浓度均值为51.6、72.2、13.5、33.1、41.7μg·m-3,青奥会期间各浓度均值为37.9、49.1、12.4、36.5、38.8μg·m-3,大气污染物浓度下降显著;而在青奥会之后,随着减排措施的取消,南京市大气污染物浓度均呈现反弹上升的趋势,各浓度均值依次为56.1、79.6、15.3、38.5、58.6μg·m-3.不同时段,PM2.5、PM10、SO2和O3浓度变化特征相似,均为青奥会之后>青奥会之前>青奥会期间,而NO2为青奥会之后>青奥会期间>青奥会之前.PM2.5、PM10、SO2、NO2日变化呈现双峰型,O3呈现单峰型的特点.

To understand the variation characteristics of atmospheric pollution in Nanjing City during the Youth Olympic Games, according tothe real-time air quality reporting system in Nanjing, we compared the concentrations and diurnal variations in different periods, including 14 days before the Youth Olympic Games （ August 3^th—16^th of 2014） , during the Games （ August 17^th—28^th of 2014） and 12 days after the Games （ August 29^th-September 9th of 2014）. The results indicated that the average concentrations of PM2.5、PM10、SO2、NO2 and O3 before the Youth Olympic Games were 51.6, 72.2, 13.5, 33.1μg·m^-3and 41.7μg·m^-3. During the Games, the average concentrations of PM2.5, PM10, SO2, NO2 and O3 were 37.9, 49.1, 12.4, 36.5 μg·m^-3 and 38.8 μg·m^-3, showing an obvious declining trend. After the Games, with the cancellation of emission abatement measures, atmospheric pollution showed an upward tendency and the average concentrations of PM2.5, PM10, SO2, NO2 and O3were 56.1, 79.6, 15.3, 38.5 μg·m^-3and 58.6 μg·m^-3.The variations of PM2.5, PM10, SO2 and O3 are similar, i.e., the period after Youth Olympic Games〉the period before Youth Olympic Games〉the period during Youth Olympic Games. The variation of NO2 is that the period after Youth Olympic Games〉the period during Youth Olympic Games〉the period before Youth Olympic Games. The diurnal variations of PM2.5, PM10, SO2 and NO2 showed double peaks and O3 showed a single peak.