Table 3 Result of the random forest model for PM_2.5 using hyperparameters of the optimum value.

Point (PM_2.5)	Train R²	Test R²	Train MSE	Test MSE
Daitou	0.53	0.33	33.2	51.3
Isahaya	0.49	0.29	29.6	43.1
Shimabara	0.49	0.31	29.4	40.1
Oomura	0.50	0.28	24.5	32.7
Kawadana	0.50	0.27	23.6	33.0
Togitsue	0.49	0.22	23.5	35.9
Yukiura	0.47	0.18	24.0	35.1
Matsuura Shisamachi	0.47	0.25	28.8	37.1
Tsushima	0.43	0.16	35.2	61.5
Iki	0.43	0.18	37.6	61.2
Goto	0.41	0.16	32.7	51.1
Obama	0.47	0.27	22.7	29.4
Kogakura	0.47	0.24	29.7	39.2
Inasa	0.46	0.21	30.3	43.4
Muramatsu	0.48	0.23	24.6	36.1
Higashi Nagasaki	0.48	0.24	25.5	36.3
Fukuishi (Jihai)	0.47	0.23	36.0	53.1
Yoshii	0.46	0.23	26.7	32.1

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