A comprehensive analysis of the spatio-temporal variation of urban air pollution in China during 2014-2018
A comprehensive analysis of the spatio-temporal variation of urban air pollution in China during 2014-2018
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2014—2018年中国城市空气污染时空变化综合分析
DOI：
10.1016/j.atmosenv.2019.117066
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发表时间：
2020-01-01
影响因子：
5
通讯作者：
Yang, Yikun
中科院分区：
文献类型：
--
作者：
Fan, Hao;Zhao, Chuanfeng;Yang, Yikun
空气污染一直是中国的一个严重的环境问题，它损害人类健康，并导致气候变化。虽然对空气污染进行了广泛的研究，但很少有研究对中国全境的空气质量指数、CO、O-3、NO2、SO2、PM10和PM2.5等空气污染组分的近期时空变化进行系统的研究。以全国空气质量地面观测数据库为基础，利用2014年5月至2018年12月的数据，对中国7个分类区域的空气污染特征和时间趋势进行了综合分析。与2014年相比，2018年大气污染物有明显下降，分别为16%的AQI、25%的CO、20%的NO2、52%的SO2、20%的PM10和28%的PM2.5。空气质量的不断改善，主要与中国严格的排放控制行动有关，伴随着气象的变化。相反，在研究期间，O-3最大日平均8h(O(3)MDA(8))以平均每年4.6%的速度持续增加。大气污染组分在空间分布上表现出明显的差异性，中国北部和中国西北部的CO值较高，中国北部和中国东部的NO2值较高，中国西北部的PM10值较高，中国北部和中国中部的PM2.5值较高，中国北部和中国东北部的SO2值较高。总体来看，北部中国平原和新疆中西部城市空气污染最为严重。从排放的角度讨论了造成这些空间分布的原因。
Air pollution has been a serious environmental problem in China that damages human health and causes climate change. While air pollution has been extensively investigated, few studies have provided systematic research on the recent space-time changes in air pollution components, including the AQI, CO, O-3, NO2, SO2, PM10 and PM2.5, over all of China. Based on the national air quality ground observation database, with data from more than 300 cities from May 2014 to December 2018, this study provides a comprehensive analysis of the characteristics and temporal trends of air pollution over the 7 classified regions in China. Compared to 2014, there are significant decreases of air pollutants in 2018, which are 16% AQI, 25% CO, 20% NO2, 52% SO2, 20% PM10, and 28% PM2.5. The constant improvement of air quality is mainly associated with rigorous emission control acts in China, along with the changes of meteorology. In contrast, O-3 maximum daily 8 h average (O(3)MDA(8)) continuously increased at an average rate of 4.6% per year during the study period. The air pollution components demonstrate distinct differences in spatial distribution, with high values of CO in North China and Northwest China, NO2 in North China and East China, PM10 in Northwest China, PM2.5 in North China and Central China, and SO2 in North China and Northeast China. Generally, air pollution is most serious in the North China Plain and in cities in central and western Xinjiang Province. Causes for these spatial distributions have been discussed from the perspective of emissions.