Table 1.

Average concentrations of VOCs at gas stations.

Location	code	VOCs concentration (µg m−3)
		Benzene	Toluene	Ethylbenzene	m/p X	o-X	n-PB	1-eth -4	1-eth-3	1,2,3-tri
Gas station A	A0	1.00 ± 4.00	112.78 ± 165.61	23.15 ± 27.60	54.63 ± 21.73	80.00 ± 91.92	1.00 ± 4.00	1.00 ± 4.00	1.00 ± 4.00	1.00 ± 4.00
	A1	9.03 ± 12.67	241.76 ± 54.24	75.19 ± 36.41	466.39 ± 313.19	185.74 ± 129.14	9.76 ± 13.95	7.03 ± 10.98	0.00 ± 7.00	18.93 ± 16.33
	A2	1.00 ± 4.00	63.34 ± 76.53	12.13 ± 12.68	56.67 ± 32.35	16.11 ± 8.06	1.00 ± 4.00	1.00 ± 4.00	1.00 ± 4.00	1.00 ± 4.00
	Mean ± SD	3.70 ± 93.40	139.12 ± 29.18	36.37 ± 82.59	192.26 ± 56.99	93.11 ± 95.64	4.80 ± 17.14	3.60 ± 26.18	1.00 ± 15.34	7.11 ± 23.99
Gas station B	B0	1.00 ± 4.00	153.70 ± 182.53	29.26 ± 26.27	163.70 ± 71.34	58.89 ± 24.83	1.00 ± 4.00	1.00 ± 4.00	1.00 ± 4.00	1.00 ± 4.00
	B1	48.14 ± 82.19	486.67 ± 255.94	214.91 ± 147.08	1518.15 ± 1354.14	707.22 ± 697.90	78.83 ± 93.16	26.57 ± 44.82	16.15 ± 20.52	69.11 ± 76.29
	B2	9.99 ± 14.92	123.52 ± 102.07	53.15 ± 24.92	231.67 ± 138.90	88.15 ± 60.80	1.00 ± 4.00	1.00 ± 4.00	1.00 ± 4.00	1.00 ± 4.00
	Mean ± SD	19.47 ± 84.00	254.24 ± 63.35	99.12 ± 11.70	637.95 ± 84.36	284.47 ± 75.65	27.60 ± 20.58	9.25 ± 77.71	6.12 ± 30.64	23.51 ± 96.01
Gas station C	C0	6/48 ± 6.55	34.29 ± 43.43	6.22 ± 6.92	94.03 ± 21.01	38.06 ± 11.39	1.61 ± 0.33	1.61 ± 0.33	1.61 ± 0.33	1.61 ± 0.33
	C1	0.766 ± 0.132	84.53 ± 116.83	4.56 ± 2.89	87.41 ± 67.85	22.22 ± 5.63	0.76 ± 0.13	0.76 ± 0.13	0.76 ± 0.13	0.76 ± 0.13
	C2	1.53 ± 0.271	119.87 ± 116.60	55.00 ± 48.85	486.21 ± 372.91	99.07 ± 87.74	1.53 ± 0.27	1.53 ± 0.27	1.53 ± 0.27	1.53 ± 0.27
	Mean ± SD	2.48 ± 3.52	85.23 ± 96.49	23.89 ± 36.81	238.61 ± 288.37	55.00 ± 56.34	1.00 ± 27.46	1.00 ± 27.46	1.00 ± 27.46	1.00 ± 27.46

0 indicates before station, 1 indicates center of station and 2 indicates after of station.

B benzene, T toluene, E ethylbenzene, m,P-x m,p-xylene, O-X o-xylene, n-PB N-Propylbenzene, 1-eth-4 1-ethyle-4-methyle benzene, 1-eth-3 1-ethyle-3-methyle benzene, 1,2,3-tri 1,2,3-trimethylebenzene.