ers ▁in ▁indust ries ▁or ▁tr ades ▁using ▁or ▁producing ▁coal , ▁cru de ▁oil ▁or ▁coal ▁products ▁are ▁at ▁highest ▁risk ▁for ▁PA H ▁expos ure . ▁In ▁general , ▁the ▁PA H s ▁are ▁formed ▁during ▁these ▁industrial ▁processes ▁by ▁incomplete ▁comb ust ion ▁or ▁py ro ly s is ▁of ▁organ ic ▁matter . ▁The ▁higher ▁the ▁temperature ▁the ▁more ▁PA H s ▁are ▁formed . ▁ ▁Some ▁of ▁these ▁PA H s , ▁such ▁as ▁ben zo [ c ] flu or ene , ▁are ▁car cin og ens ▁and ▁mut agens ▁and ▁act ▁as ▁possible ▁end ocr ine ▁dis rupt ors . ▁To ▁estimate ▁the ▁health ▁effects ▁that ▁arise ▁from ▁expos ure ▁to ▁PA H s ▁and ▁ben zo [ c ] flu or ene ▁it ▁is ▁necessary ▁to ▁determine ▁the ▁concentration ▁of ▁these ▁comp ounds ▁in ▁the ▁atmosphere . ▁This ▁was ▁done ▁in ▁a ▁study ▁by ▁Mor is aki ▁et ▁al . ▁ 2 0 1 6 . ▁They ▁compared ▁the ▁concentr ations ▁of ▁different ▁PA H s ▁including ▁ben zo [ c ] flu or ene ▁in ▁Be ij ing ▁and ▁Kan az awa ▁in ▁winter ▁and ▁summer . ▁ ▁The ▁research ers ▁corrected ▁for ▁the ▁relative ▁mut agen icity ▁of ▁comp ounds ▁compared ▁to ▁ben zo [ a ] py rene . ▁The ▁results ▁of ▁this ▁are ▁presented ▁as ▁Ba P eq , ▁which ▁equals ▁the ▁concentration ▁of ▁the ▁comp ound , ▁times ▁the ▁pot ency ▁of ▁the ▁comp ound ▁compared ▁to ▁ben zo [