Seasonal variation of polycyclic aromatic hydrocarbons concentrations in urban streams at Niterói City, RJ, Brazil

► Water samples collected in urban streams and lake. ► Determination of concentrations of PAHs and ∑PAHs. ► Concentrations significantly correlated with rainfall with seasonal variation. ► Role of rivers and streams neighbor to the bay in PAH transport into Guanabara Bay. ► Assessment of contamination by PAHs of Guanabara Bay related to rivers.