A new approach to evaluate regional inequity determined by PM2.5 emissions and concentrations

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:277

Article

Chuai, Xiaowei¹  Lu, Yue¹  Xie, Fangjian²  Yang, Feng²  Zhao, Rongqin³  Pang, Baoxin¹ 

[1] Nanjing Univ, Sch Geog & Ocean Sci, Nanjing 210046, Jiangsu, Peoples R China

[2] Nanjing Municipal Acad Environm Protect Sci, Nanjing 210093, Jiangsu, Peoples R China

[3] North China Univ Water Resources & Elect Power, Sch Surveying & Geoinformat, Zhengzhou 450046, Henan, Peoples R China

关键词: PM2.5 emissions;    PM2.5 concentrations;    Temporal-spatial changes;    Relationship;    Regional inequity;   

DOI  :  10.1016/j.jenvman.2020.111335

来源: Elsevier

【 摘 要 】

PM2.5 is one of the most severe types of air pollution that threatens human health. Its emissions have a notable spillover effect once released into the atmosphere and transported. In domestic trade, PM2.5 emissions can be indirectly imported from external regions. Thus, regional inequity caused by PM2.5 needs to be integrated and comprehensively estimated. Based on PM2.5 emissions/concentrations grid maps and an input-output model, this study first examined the temporal-spatial changes in PM2.5 emissions/concentrations across China. Additionally, a detailed relationship between PM2.5 emissions and concentrations was examined at multiple scales, both temporal and spatial. Finally, this study developed a new approach with which to evaluate regional inequity. The results show that PM2.5 emissions and concentrations increased between 1990 and 2012 and 1998 and 2016, respectively; the increase was more obvious for PM2.5 emissions. Spatially, a rapid increase in PM2.5 emissions was observed in the North China Plain and the Sichuan Basin. Between 1998 and 2012, the distribution of PM2.5 concentrations was similar to that of emissions; however, between 2013 and 2016, 46.6% of the total area showed a decrease, mainly in the central and southern parts of China. Relationship analysis revealed that PM2.5 emissions and concentrations are closely correlated in both time and space. There was obvious regional inequity among provinces; developed regions always imported considerably more PM2.5 emissions from undeveloped regions than they exported. Overall, the regional inequity estimation framework shows that provinces along the coastline, especially developed provinces, have advantages under the regional inequity estimation framework, while most of the inland regions have disadvantages, especially in the west and north.

【 授权许可】

Free