Table 1. Geochemical indices describing PAHs in vegetation and soil in the outskirt of Xi’an.

	LPAHs/HPAHs	Ant/(Ant+Phe)	Fla/(Fla+Pyr)	Baa/(Baa+Chr)	I1p/(I1p+Bgp)
VGaomiao	2.3	0.5	0.6	0.5	0.5
VJiangwu	5.6	0.5	0.6	0.5	0.5
VLiulin	3.2	0.5	0.4	0.5	0.5
VMoling	3.8	0.5	0.6	0.5	0.5
VShijia	1.6	0.1	0.7	0.5	0.5
VWeijia	3.2	0.5	0.8	0.5	0.5
VXicha	3.9	0.4	0.4	0.5	0.5
VXiwang	5.8	0.4	0.5	0.5	0.5
VXingnan	5.1	0.4	0.5	0.5	0.5
VChangjia	5.5	0.5	0.6	0.5	0.5
VGuanmiao	2.8	0.6	0.3	0.5	0.5
VLiangzhao	4.7	0.6	0.4	0.5	0.5
VDujia	2.3	0.5	0.1	0.5	0.4
SGaomiao	0.8	0.4	0.7	0.5	0.4
SJiangwu	0.5	0.6	0.5	0.2	0.4
SLiulin	0.8	0.3	0.3	0.1	0.2
SMoling	0.9	0.2	0.6	0.3	0.3
SShijia	1.0	0.3	0.6	0.3	0.6
SWeijia	0.7	0.5	0.7	0.4	0.2
SXicha	0.5	0.1	0.6	0.3	0.3
SXiwang	0.6	0.4	0.5	0.3	0.5
SXingnan	0.7	0.1	0.6	0.3	0.4
SChangjia	0.5	0.1	0.6	0.2	0.4
SGuanmiao	0.5	0.9	0.1	0.4	0.3
SLiangzhao	0.7	0.7	0.6	0.2	0.4
SDujia	0.3	0.2	0.5	0.4	0.4

The soil samples and vegetable samples were labeled by S and V, respectively. LPAHs/HPAHs, the ratio of the sum of 2- to 3-ring PAHs with low molecular weight to the sum of 4- to 6-ring PAHs with high molecular weight; Phe, phenanthrene; Ant, anthracene; Fla, fluoranthene, Pyr, pyrene; Baa, benzo(a)anthracene; Chr, chrysene; Bgp, benzo(g, h, i)perylene; I1P, indeno(1, 2, 3-c, d)pyrene.