Table 2.

Concentration range (C), odour intensity (I) and hedonic tone (HT) of the samples: toluene, acetone, triethylamine (set A and B) and formaldehyde, butyric acid, pinene (set C and D).

		Toluene	Acetone	Triethylamine	Formaldehyde	Butyric Acid	α-Pinene
Set A	C (ppm v/v)	0.06–0.6	60–600	0.15–1.5
	I	0–1	0–1	0–1
	HT	−0.8–0	−0.9–0	−0.9–0
Set B	C (ppm v/v)	0.4–3.7	390–3900	0.5–5.5
	I	0.8–2	0.75–2	0.25–2
	HT	−1.6–−0.6	−1.75–−0.7	−1.8–−0.2
Set C	C (ppm v/v)				50–540	0.5–4.7	0.01–0.13
	I				0–1	0–1	0–1
	HT				−0.8–0	−0.8–0	0–0.5
Set D	C (ppm v/v)				360–3600	1.5–14.5	0.05–0.5
	I				0.8–2	0–2	0.3–2
	HT				−1.6–−0.6	−1.6–0	0.15–1