APEC期间北京及周边城市AQI区域特征及天气背景分析

Analysis on Regional Characteristics of Air Quality Index and Weather Situation in Beijing and Its Surrounding Cities During the APEC

利用环境监测总站公布的监测资料,分析2014年11月1日至15日,即北京举办亚太经合组织(Asia-Pacific Economic Cooperation,APEC)会议期间北京及周边地区空气质量演变及区域特征,结合中国气象局官方发布的同期气象要素和天气形势图,探讨天气背景对APEC期间空气质量改善的影响,结果表明:1强化减排措施实施期间,北京及周边地区良好和轻度污染的天数相对较多,而强化减排措施终止后,重度和严重污染的天数明显增多,表明强化减排措施对北京及周边城市局地空气质量的改善贡献明显;2强化减排措施实施初期,受逆温层的影响,北京及周边城市空气质量指数迅速上升,说明在不利的天气背景下,即便有强化减排措施,污染物也会累积升高,形成污染过程,可见天气背景对空气质量的影响不容忽视;3在强化措施实施后期,虽然受逆温层影响,北京污染物的浓度并没有累积到很高的程度,而天津、唐山、保定和邢台均出现中度和重度污染,进一步说明,强化减排措施的实施对改善北京空气质量的贡献明显.

Analysis on the revolution and regional characteristics of air quality by hourly monitored readings from 1 to 15 November2014 released by Environmental Monitoring Station of China and research of the impacts of weather situation and meteorological elements released by China Meteorological Administration towards air quality of Beijing and its surrounding cities during the AsiaPacific Economic Cooperation( APEC) indicated that: 1 The air quality was good because of the implementation of mitigation measures,while the Air Quality Index( AQI) increased along with the termination of mitigation measures. Thus it can be seen that mitigation measures made a great contribution to the improvement of air quality of Beijing and its surrounding cities. 2 Affected by thermal inversion layer,AQI of Beijing and its surrounding cities increased quickly during the initial of the implemental of reducing measures which proved that pollutants would accumulate in the context of unfavourable weather,hence the influence of weather situation towards air quality could not be ignored. 3 Although affected by thermal inversion layer,the concentration of pollutants of Beijing was not accumulated to a high degree at the end period of reducing measures,while Tianjin,Tangshan,Baoding and Xingtai suffered from moderate and severe pollution at the same time which further illustrated that the implementation of mitigation measures have made a great contribution to the improvement of air quality in Beijing during APEC.