Toxicity equivalent quantity (TEQ_BaP) levels (ng g⁻¹ dw) in the topsoil (0–20 cm) of the study areas^a.

PAHs TEQc	TEFb	Kingtom		Waterloo		Bonganema		Magburaka		Kabala		Sinikoro		Makeni
		Range	Mean	Range	Mean	Range	Mean	Range	Mean	Range	Mean	Range	Mean	Range	Mean
Nap	0.001	0.075–0.289	0.189	0.035–0.113	0.068	0.021–0.028	0.024	0.010–0.062	0.036	0.011–0.050	0.030	0.028–0.03	0.030	0.009–0.030	0.019
Acy	0.001	0.009–0.016	0.012	0.001–0.003	0.002	0.001–0.001	0.001	0.001–0.001	0.001	0.001–0.001	0.001	0.001–0.001	0.001	0.001–0.001	0.001
Ace	0.001	0.004–0.010	0.008	0.002–0.005	0.003	0.001–0.002	0.001	0.001–0.001	0.001	0.001–0.002	0.001	0.001–0.001	0.001	0.001–0.001	0.001
Flo	0.001	0.009–0.017	0.013	0.004–0.005	0.005	0.003–0.004	0.003	0.002–0.002	0.002	0.002–0.005	0.003	0.002–0.003	0.003	0.002–0.003	0.003
Phe	0.001	0.080–0.115	0.100	0.018–0.038	0.030	0.009–0.014	0.012	0.006–0.008	0.007	0.005–0.012	0.008	0.007–0.010	0.008	0.005–0.006	0.006
Ant	0.01	0.125–0.188	0.158	0.039–0.040	0.040	0.010–0.027	0.016	0.005–0.011	0.008	0.005–0.013	0.009	0.007–0.013	0.010	0.003–0.007	0.005
Fluo	0.001	0.069–0.140	0.097	0.020–0.045	0.030	0.003–0.006	0.005	0.001–0.006	0.004	0.002–0.003	0.002	0.002–0.004	0.003	0.002–0.002	0.002
Pyr	0.001	0.063–0.136	0.093	0.018–0.040	0.030	0.002–0.004	0.003	0.001–0.005	0.003	0.001–0.002	0.002	0.002–0.003	0.002	0.001–0.002	0.001
BaA	0.1	2.807–10.717	5.842	0.600–1.616	0.980	0.038–0.050	0.042	0.040–0.368	0.203	0.046–0.052	0.049	0.043–0.065	0.054	0.045–0.064	0.054
Chr	0.01	0.592–1.571	1.001	0.178–0.352	0.260	0.007–0.013	0.010	0.010–0.082	0.046	0.014–0.020	0.017	0.009–0.017	0.013	0.009–0.013	0.011
BbF	0.1	5.748–14.071	8.538	0.799–1.897	1.270	ND – 0.034	0.032	ND – 0.599	0.599	0.051–0.011	0.080	ND	ND	ND	ND
BkF	0.1	4.030–9.794	6.029	0.762–1.412	1.030	0.029–0.053	0.041	0.070–0.381	0.226	0.056–0.073	0.064	0.050–0.090	0.070	0.040–0.043	0.042
BaP	1	64.256–187.564	105.980	11.826–25.740	18.800	ND – 0.715	0.715	ND – 4.913	4.913	ND – 0.889	0.889	0.705–0.802	0.754	ND	ND
IcdP	0.1	5.687–14.156	8.677	0.425–0.828	0.610	ND – 0.018	0.014	0.039–0.341	0.190	0.008–0.046	0.027	0.007–0.007	0.007	0.027–0.027	0.027
DahA	1	2.716–32.990	15.877	1.063–1.991	1.570	0.149–0.174	0.158	0.250–0.557	0.404	0.225–0.310	0.267	0.116–0.230	0.173	0.059–0.245	0.152
BghiP	0.01	0.676–1.631	1.020	0.087–0.152	0.130	0.001–0.001	0.001	0.003–0.048	0.025	ND – 0.001	0.001	0.002–0.007	0.004	ND – 0.002	0.001
ΣTEQBaP		86.946–273.387	153.635	15.887–34.277	24.900	0.273–1.144	1.078	0.436–7.388	6.668	0.427–1.588	1.452	0.982–1.283	1.132	0.178–0.446	0.326

^aΣTEQ_BaP is the sum of the BaP toxicity equivalent quantity in soil; ND (Not detected).

^bTEF is the toxicity equivalent factor.

^cTEQ is the toxicity equivalent quantity for the individual PAH in the soil.