Temporal trends in daily dietary intakes of DDTs and HCHs in urban populations from Beijing and Shenyang, China

► Three representative time periods were selected. ► Daily dietary intakes of DDTs and HCHs by target populations decreased temporally. ► Relative contributions of foods to the intakes of DDTs and HCHs varied with time. ► DDT and HCH intakes in 2005-2007 would not exert adverse effect on human health.