Table 3.

Concentration in ppbV of principal compounds in air samples.

Station	Benzene	Heptane	Toluene	Etyl Benzene	m,p-Xylene	o-Xylene	4 Ethyl Toluene	1,3,5 Trimethyl Benzene	1,2,4 Trimethyl Benzene
1	3.4	0.98	12	2.2	9.1	3.1	2.1	0.94	3.6
1	3.7	1.0	12	2.2	9.3	3.2	2.2	0.95	3.8
1	3.4	0.95	11	2.1	8.7	3.0	2.1	0.93	3.6
1	3.5	1.0	12	2.2	9.0	3.2	2.1	0.96	3.6
2	1.0	1.2	5.9	1.1	3.7	1.2	<LOQ	<LOQ	1.0
2	1.1	1.1	6.1	1.1	3.8	1.2	<LOQ	<LOQ	0.97
2	1.1	1.2	6.2	1.1	3.9	1.2	<LOQ	<LOQ	1.2
2	1.1	1.2	6.4	1.2	4.1	1.2	<LOQ	<LOQ	1.1
3	6.1	2.0	20	3.8	16	6.0	5.2	2.6	11
3	5.6	2.0	19	3.7	15	5.8	4.8	2.5	9.9
3	5.7	1.9	19	3.9	15	6.5	5.3	2.8	12
3	5.6	1.8	19	3.7	14	5.9	4.2	2.1	8.2
4	3.4	1.0	11	1.9	7.7	3.2	2.0	0.65	4.0
4	3.4	0.95	11	1.9	7.8	3.1	2.0	0.59	3.9
4	3.2	0.98	11	1.9	7.7	3.2	2.0	0.60	4.1
4	3.2	0.92	11	1.8	7.2	3.2	1.9	0.50	3.6
5	6.3	2.3	23	4.3	16	6.3	1.9	2.4	9.9
5	6.3	2.3	23	4.3	16	6.2	1.9	2.3	9.7
5	5.9	2.1	22	4.0	16	6.2	2.0	2.4	10
5	6.1	2.2	22	4.1	16	6.2	1.9	2.3	9.6
6	2.1	0.46	5.8	0.95	3.9	1.4	0.45	<LOQ	0.78
6	2.1	0.46	5.8	0.94	3.8	1.3	0.40	<LOQ	0.70
6	2.0	0.46	5.5	0.94	3.7	1.3	0.45	<LOQ	0.85
6	2.0	0.47	5.6	0.96	3.8	1.3	0.61	<LOQ	0.76
7	15	4.6	46	9.3	32	13	11	5.2	21
7	15	4.6	45	9.1	32	12	11	5.2	21
7	16	5.1	50	10	36	14	12	5.9	24
7	16	5.6	52	11	41	16	14	7.1	30
8	7.1	2.2	24	3.0	12	4.3	3.5	1.2	4.7
8	7.2	2.2	24	3.0	12	4.4	3.3	1.2	4.6
8	7.8	2.3	25	3.3	13	4.7	3.8	1.3	5.2
8	7.6	2.2	24	3.2	12	4.6	3.8	1.3	5.1
9	3.6	1.3	9.3	1.5	6.7	2.2	1.3	0.50	2.2
9	3.5	1.2	8.9	1.4	6.3	2.1	1.2	0.43	1.9
9	3.5	1.2	9.2	1.5	6.5	2.1	1.4	0.48	2.1
9	3.5	1.2	9.2	1.5	6.6	2.2	1.5	0.51	1.9
10	4.2	1.2	10	1.8	7.7	2.7	1.7	0.57	2.1
10	4.1	1.1	10	1.8	7.4	2.5	1.7	0.58	2.1
10	3.9	0.96	9.2	1.6	7.1	2.4	1.7	0.62	2.2
10	4.1	1.0	9.7	1.7	7.3	2.4	1.8	0.61	2.3

LOQ = Limit of quantification.