It can be observed that, along all four directions, the PM 2.5 concentrations interpolated by the OK method almost first demonstrated an increasing trend and then gradually decreased, while those simulated by LUR model at the same local sites were relatively lower and stable at two ends but higher and fluctuated in the middle.
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Performance comparison of LUR and OK in PM2.5 concentration mapping: a multidimensional perspective.
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The sentences
This is reflected by the LUR model simulated result, which shows a decreasing trend from Harris County to surrounding areas.