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- W2988148889 startingPage "123312" @default.
- W2988148889 abstract "Air pollution has caused widespread environmental and public health problems and aroused significant attention around the world. Based on the daily air quality index (AQI) data of 35 major cities in China, the cross-correlation functions of time lags between cities are calculated and a sequence of time-evolving directed and weighted AQI correlation networks is built. The probability distribution of correlations is separated into positive and negative parts. The probability distribution of time lag exhibits that the effect of time lag is clear for cities with negative correlations and not for cities with positive correlations. Further, percolation theory technique is put forward to analyze the behavior of connected clusters in the correlation networks. The results show that abrupt phase transition usually occurs between three to six weeks ahead of the peak or valley point of the evolution of AQIs mean for highly polluted region, which suggests that this event can make an alarm. The method and results presented not only improve the understanding of the climate effects and correlated effects of AQIs, but also facilitate the study of air pollution forecasting and warning." @default.
- W2988148889 created "2019-11-22" @default.
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- W2988148889 date "2020-03-01" @default.
- W2988148889 modified "2023-10-15" @default.
- W2988148889 title "Percolation analysis of urban air quality: A case in China" @default.
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- W2988148889 doi "https://doi.org/10.1016/j.physa.2019.123312" @default.
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