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Part of ammonium ions in blackwater oxidises as nitrate ions that travel to the aquifer. Upon mixing and dilution, the nitrate concentration in 1 km2 of hard rock aquifer would annually increase by 0.004 mg/L due to blackwater infiltration from single household pour flush toilet.The existing literature on the environmental Kuznets curve (EKC) fails to investigate the spatial attribute of the "pollution halo" effect or to integrate the "pollution haven" effect. This paper extends the EKC model to the spatial Durbin model by exploring the