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

Table 8

The results of the hybrid model for NO₂.

	Actual value (unit: μg/m^3)	Predictive value (unit: μg/m^3)	APE (%)
12–20	83	83	0
12–21	74	79	6.8
12–22	91	71	22.0
12–23	37	50	35.1
12–24	75	70	6.7
12–25	89	61	31.5
12–26	47	47	0
12–27	35	38	8.6
12–28	40	48	20.0
12–29	50	53	6
12–30	60	60	0
MAPE			12.4
12–31	76	70	7.9
01–01	77	78	1.3
01–02	93	93	0
01–03	100	100	0
MAPE			2.3