G20 峰会期间杭州及周边地区空气质量的演变与评估

Evolution and evaluation of air quality in Hangzhou and its surrounding area during the G20 summit

为了研究G20峰会期间杭州市及其周边地区大气质量状况,评估保障措施的实施对空气质量的影响,利用2016年8月24日-2016年9月6日杭州及其周边城市空气质量监测数据,分析其时空分布特征,并与2015年同期数据进行比较.结果显示:(1)2016年8月24日-9月6日即会期保障阶段,杭州市PM_(2.5),PM_(10),SO_2,NO_2,CO和O_3浓度均值为31.52μg/m^3,46.55μg/m^3,8.92μg/m^3,15.22μg/m^3,0.62mg/m^3和113.98μg/m^3.(2)与2015年同期相比,会议保障阶段杭州市PM_(2.5),PM_(10),SO_2,NO_2和CO浓度分别下降了40.16%,37.71%,25.98%,56.30%和30.34%,O_3浓度则上升了19.89%.(3)2016年会期保障阶段,2015年同期和G20峰会举办期间的3个时段,污染物日变化特征相似,除O_3外,其他污染物整体上呈现2015年同期>2016年会期保障阶段>G20峰会举办期间的特点.(4)空间上而言,会期保障阶段O_3浓度在空间上表现出显著上升,其他污染物浓度同比有明显下降,其中PM_(2.5)和PM_(10)在空间上的差异较小,而SO_2和NO_2在空间上的差异较大.(5)G20峰会期间采取的保障措施确保了杭州市及其周边地区大气质量得到了改善.

In order to realize air quality status in Hangzhou and its surrounding cities during the G20summit,evaluatethe effects of the implementation of safeguard measures.The concentration of air pollutants were analyzed based onpollutants observation sites in Hangzhou City and its surrounding cities from August24,2016to September6,2016,andcompared with that in2015.The results showed that:①During the period of the safeguard,the average concentrations ofPM2.5,PM10,SO2,NO2,CO and O3were31.52μg/m3,46.55μg/m3,8.92μg/m3,15.22μg/m3,0.62mg/m3and113.98μg/m3,respectively.②Compared with the same time in2015,the average concentrations of PM2.5,PM10,SO2,NO2and COwere decreased by40.16%,37.71%,25.98%,56.30%and30.34%,respectively,the average concentrations of O3wasincreased by19.89%during the safeguard period.③Diurnal variation of pollutants are similar in three periods,thesame time in2015>the safeguard period in2016>the G20summit period,except for ozone.④The concentration ofozone showed a significant increase and other air pollutants showed a significant decline in space,compared to the sametime in2015,the spatial difference of PM10and PM2.5were small,the spatial difference of SO2and NO2were big.⑤Safeguard measures were taken to ensure that the air quality in Hangzhou and its surrounding cities had been improvedduring the G20summit.Key words:G20summit;