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. 2010 May 5;20(3):177–184. doi: 10.2188/jea.JE20100010

Figure 2. A graph of the concentration of suspended particulate matter (SPM) showing a long-term trend and seasonality. These monthly measurements of the mean concentration of SPM at Mibu, Kyoto, Japan were obtained from the National Institute for Environmental Studies, Tsukuba, Japan.

Figure 2.