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. Author manuscript; available in PMC: 2022 Jan 21.
Published in final edited form as: Analyst. 2020 Nov 18;146(2):636–645. doi: 10.1039/d0an01521k

Table 4.

Concentration for BTEX compounds in the studies locations. Concentration values expressed in ng m−3 of air and standard deviation inside parenthesis (SD)

Quiet street Busy garage Gas station Freeway
benzene 1.7 (0.7) 16.5 (3.1) 69.9 (35.0) 2.1 (0.3)
toluene 6.9 (0.2) 120.1 (76.7) 1213.1 (115.0) 4.6 (0.4)
ethylbenzene 2.6 (0.1) 60.9 (6.7) 278.3 (20.0) 0.7 (0.2)
(m+p)-xylene 5.6 (0.0) 150.9 (1.7) 508.6 (2.9) 1.2 (0.1)
o-xylene 3.1 (0.7) 54.6 (7.7) 281.6 (24.8) 1.2 (0.3)
Ratio toluene/benzene (T/B) 4.0 (1.7) 7.3 (3.3) 17.4 (8.1) 2.2 (0.5)
Ratio (m+p-xylene)/ ethylbenzene 0.4 (0.0) 0.5 (0.3) 0.2 (0.1) 0.2 (0.6)