European Chemicals Agency as very toxic to aquatic life with long
lasting effects (ECHA, 2023); no toxicity data were found for 4-meth-
yldibenzo[b,d]thiophene and 2,3-dimethyldibenzo[b,d]thiophene.
Single LMW PAH, including Nap and alkylnaphthalenes, showed no
significant and, in general, lower correlation. Many of these compounds
were also found in relevant concentrations in the samples, however,
they have been indicated to have lower toxicity (Lille-Langoy et al.,
2021). In turn, single HMW PAH, which have a higher toxicity (Kamelia
et al., 2018), showed concentrations mostly