Optimized arrangement of constant ambient air monitoring stations in the Kanto region of Japan.

Except for O x , pollutant concentrations are lower than the entire Kanto region average, and had a decreasing trend over the decade.

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We then introduced three simple criteria to reduce the number of monitoring stations: (1) retain the monitoring station if there were similarities between its data and average data of the group to which it belongs; (2) retain the station if its data showed higher concentrations; and (3) retain the station if the monitored concentration levels had an increasing trend.

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