Such a method should be simple, versatile, and mechanical and thus, we suggest that the number of monitoring stations in the Kanto region could be reduced by adopting the following three simple criteria: (1) retain the monitoring station (or chemical) if similarities exist between its monitored data and the averaged monitored data of the cluster to which it belongs; (2) retain the monitoring station (or chemical) if the monitored data show higher concentrations; and (3) retain the monitoring station (or chemical) if the monitored concentration levels exhibit an increasing trend.
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A cluster analysis of constant ambient air monitoring data from the Kanto region of Japan.
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