Table 7.

February 2019, CO, NO₂, PM10, LR, ANN, RF.

Pollutant, Algorithm (Input Features)	${\mathit{R}}^2$		RMSE
	Calibration	Test	Calibration	Test
CO, LR (raw)	0.933		0.053
CO, ANN (raw, RH, T)	0.980	0.968	0.031	0.038
CO, RF (raw, RH, T)	0.993	0.934	0.017	0.052
NO2, LR (raw)	0.784		8.940
NO2, ANN (raw, RH, T)	0.857	0.832	7.986	8.625
NO2, RF (raw, RH, T)	0.985	0.904	2.360	5.976
PM10, LR (raw)	0.716		12.012
PM10, ANN (raw, RH, T)	0.780	0.737	11.567	12.549
PM10, RF (raw, RH, T)	0.962	0.767	4.436	10.221