Table 3.

Confusion matrix obtained in leave-one-out cross-validation (LOOCV).

	NO2 40 µg/m3	NO2 80 µg/m3	NO2 120 µg/m3	NO2 165 µg/m3	NO2 205 µg/m3	NO 7.7 µg/m3	NO 15.5 µg/m3	NO 38.5 µg/m3	NO 77 µg/m3
NO2 40 µg/m3	9	0	0	0	0	0	0	0	0
NO2 80 µg/m3	0	9	0	0	0	0	0	0	0
NO2 120 µg/m3	0	0	8	1	0	0	0	0	0
NO2 165 µg/m3	0	0	1	6	2	0	0	0	0
NO2 205 µg/m3	0	0	0	1	7	0	1	0	0
NO 7.7 µg/m3	0	0	0	0	0	9	0	0	0
NO 15.5 µg/m3	0	0	0	0	0	0	9	0	0
NO 38.5 µg/m3	0	0	0	0	0	0	0	9	0
NO 77 µg/m3	0	0	0	0	0	0	0	0	9