Table 8.

Accuracy results of various feature extraction techniques and classification models for datasets in [56].

Class	Accuracy Rate (%)
	KELM	SVM	ELM	KNN	LDA	QDA
HCHO	94.23	94.23	92.31	90.38	94.23	63.46
C6H6	90.91	87.88	72.73	75.76	57.58	87.88
C7H8	100.00	100.00	100.00	100.00	100.00	100.00
CO	100.00	91.67	100.00	91.67	83.33	100.00
NH3	70.00	60.00	70.00	70.00	80.00	80.00
NO2	100.00	100.00	66.67	66.67	83.33	83.33
Average	92.52	88.96	83.62	82.41	83.08	85.78