Table 8.

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

Pollutant, Algorithm (Input Features)	${\mathit{R}}^2$		RMSE
	Calibration	Test	Calibration	Test
CO, LR (raw)	0.949		0.054
CO, ANN (raw, RH, T)	0.982	0.974	0.032	0.039
CO, RF (raw, RH, T)	0.996	0.970	0.015	0.042
NO2, LR (raw)	0.846		9.278
NO2, ANN (raw, RH, T)	0.889	0.866	9.463	10.001
NO2, RF (raw, RH, T)	0.993	0.943	2.008	5.695
PM10, LR (raw)	0.849		8.070
PM10, ANN (raw, RH, T)	0.888	0.867	8.111	8.680
PM10, RF (raw, RH, T)	0.984	0.891	2.806	7.204