“…According to Polish guidelines, the acceptable maximum permissible concentration (MPC) for Anth, Ch, IndPyr and BPer is 200 μg kg −1 , while for Napht, BaA, BbF, BkF, BaPyr and DahA, the MPC is 100 μg kg −1 . HQ values of individual PAH compound > 1 indicate a possible ecological risk [ 11 , 17 , 49 ]. Average HQ value of a single chemical (expressed as median) varied significantly depending on PAH compound from 0.06 for Anth to 1.32 for BbF ( Table 2 ), what allows us to conclude that according to individual PAH, 7 to 62% of the study area might be under ecological risk (HQ above 1), and needs further actions (e.g., site-specific evaluation or remediation).…”