Table 2: The average VOC concentrations at the three experimental site. The chemical element values over the detection limits are reported in bold.

µg/m3	Average (Burgesi)	Average (Cavallino)	Average (Nardò)
Sulfhydric	< 0.5	< 0.5	< 0.5
Mercaptans	< 0.5	< 0.5	< 0.5
Methanol	< 0.5	< 0.5	< 0.5
Ethanol	< 0.5	< 0.5	< 0.5
n-butyl alcohol	< 0.5	< 0.5	< 0.5
sec-butyl alcohol	< 0.5	< 0.5	< 0.5
t-butyl alcohol	< 0.5	< 0.5	< 0.5
i-propyl alcohol	< 0.5	< 0.5	< 0.5
l- butyl acetate	< 0.5	< 0.5	< 0.5
D-Limonene	3.4	12.8	6.4
α-pynene	2.4	7.6	0.9
acetone	< 0.5	< 0.5	< 0.5
methyl ethyl ketone	< 0.5	< 0.5	< 0.5
2-butoxyethanol	< 0.5	< 0.5	< 0.5
ethyl acetate	< 0.5	< 0.5	< 0.5
Diethylene glycol monoethyl ether	< 0.5	< 0.5	< 0.5
n-butyl acetate	< 0.5	< 0.5	< 0.5
alkyl-substituted benzene	< 0.5	8.5	< 0.5