A　comprehensive　investigation　was　conducted　to　the　urban　(Pudong)　and　suburban　soils　in　Shanghai.　A　total　of　154　soil　samples　were　analyzed　for　26　PAHs　including　highly　carcinogenic　dibenzopyrenes　(DBPs).　The　total　concentrations　ranged　from　25.8　to　7380　lig　kg-1　for　E26PAH5　and　18.8　to　6320　lig　kg-1　for　16　USEPA　priority　PAHs　(E16PAHs),　respectively.　The　BaP　toxic　equivalent　(BaPeq)　concentrations　were　between　6.41　and　2880　p,g　kg-1　for　E24PAH5,　1.11　and　620　pig　kg-1　for　E16PAHs　and　2.72　and　2250　gg　kg-1　for　E4DBPs.　The　high　PAM　contamination　in　green　land　soils　might　originate　mainly　from　local　road　traffic　and　industrial　activities,　and　sewage　sludge　application　or　waste　water　irrigation　for　soil.　Seven　sources　of　soil　PAHs　in　Shanghai　were　identified　by　positive　matrix　factorization　(PMF)　model.　The　mean　risk　quotient　(m-RQ)　values　indicated　that　there　were　medium　to　high　ecological　risks　in　9.10%　of　soil　samples,　pyrene　(Pyr),　benzo[b]fluoranthene　(BbF)　and　benz[a]anthracene　(BaA)　were　the　major　ecological　risk　drivers　under　agricultural　use.　The　cancer　risk　(CR)　values　were　within　the　acceptable　range　at　35.7%,　35.1%　and　31.2%　of　sampling　sites　for　children,　youths　and　adults,　respectively.　The　total　lifetime　carcinogenic　risk　(TLCR)　values　at　57.8%　of　sampling　sites　were　within　the　acceptable　range.　Overall,　cancer　risks　of　soil　PAHs　in　all　sampling　sites　in　the　studied　area　were　below　the　highest　acceptable　risk,　suggesting　that　soil　PAHs　are　unlikely　to　pose　a　significant　cancer　risk　for　population　based　on　ingestion,　dermal　contact　and　inhalation　exposure　pathways.　(C)　2014　Elsevier　Ltd.　All　rights　reserved.