My paper titled ‘A framework for delineating the regional boundaries of PM2.5 pollution: A case study of China’ is accepted by Environmental Pollution on 18 December 2017. It addresses an important topic: PM2.5 pollutions. The literature has well demonstrated the PM2.5 problem is a regional issue but we found that there is little research in answering important questions such as how regional are the PM2.5 pollutions? In other words, how large is the area where the PM2.5 pollutions interact with each other? Is there an approach to delineate the boundaries of PM2.5 pollutions? In an attempt to address these questions, our paper proposes a novel framework for delineating the boundaries of PM2.5 pollutions. The framework consists of four steps and uses cross correlation method, time-series cluster analysis technique, Voronoi polygons, and polynomial approximation with exponential kernel method. Then this paper applied this framework in China using ground-based PM2.5 data and the boundaries of PM2.5 pollutions in China are delineated. The primary contribution of our study is the provision of this framework as a tool to delineate PM2.5 boundaries and identify the area where the PM2.5 pollutions interact with each other. It also provides a useful reference for policymakers and practitioners to define management zones for regional air pollution control and assess impact related to PM2.5 pollutions.
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