Exploring the convergence patterns of PM2.5 in Chinese cities.

Finally, considering the relationship between the mean and annual growth rate, although the mean PM2.5 concentrations decreased successively from Club H-H to Club VL-H, the growth rates showed a trend of increase and then decrease.

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For example, the population density ( popula ) of clubs with high PM2.5 concentrations is significantly higher than that of clubs with low concentrations, and there is an apparent trend that the higher the PM2.5 concentration of the club, that is from Club VL-H to Club H-H, the higher the population density.

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