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In this study, the Daily Air Pollution Index (DAPI) of 81 cities in China from June 2004 to June 2007 was used to study the air pollution of city clusters. The cluster analysis results show that the DAPI of 71 cities in central and eastern China is divided into two regimes, the north regime and the south regime along the Qinling Mountain and its eastern extension to Huaihe River. The demarcation line...
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