Table 5.

Comparison of calibration performance by input variables (long-term: 80%—training dataset, 20%—test dataset, shuffled method, 5 min sampling interval condition)

Input Variables	Linear - ULR/MLR			Nonlinear - MLP
	MAE	MSE	R${}^2$	MAE	MSE	R${}^2$
[uncalibrated] Raw PM	15.87	573.23	0.41	15.87	573.23	0.41
[ calibrated] Raw PM	4.28	33.79	0.82	4.21	33.79	0.79
[ calibrated] Raw PM + Humidity	4.01	30.13	0.84	4.04	32.15	0.77
[ calibrated] Raw PM + Humidity + Temp.	4.00	29.90	0.84	3.52	23.88	0.86