Short-Term Air Quality Prediction Based on Fractional Grey Linear Regression and Support Vector Machine

Table 7

The results of the hybrid model for PM_2.5

	Actual value (unit: μg/m^3)	Predictive value (unit: μg/m^3)	APE (%)
12–20	134	124	7.5
12–21	79	90	13.9
12–22	138	128	7.2
12–23	51	61	19.6
12–24	90	99	10.0
12–25	148	127	14.2
12–26	66	66	0
12–27	40	40	0
12–28	33	48	45.5
12–29	39	48	23.1
12–30	72	62	13.9
MAPE			14.1
12–31	142	131	7.7
01–01	127	119	6.3
01–02	182	182	0
01–03	203	120	40.9
MAPE			13.7