Abstract: To investigate regional distribution, atmospheric transportation and sources of persistent organic pollutants (POPs), a passive air sampling campaign was carried out from July 2006 to June 2008 at six sites in Tianjin. Based on GC/HRMS analytical data, it was revealed that air concentrations of HCB, HCHs, and DDTs varied substantially over sites; the relative compositions of organochlorine pollutants had clear seasonal variations; passive air samples were classified according to seasons rather than their site functionalities in cluster analysis; it implied a strong regional similarity of relative compositions of organochlorine pollutants among sites in Tianjin, due to the impact of atmospheric transportation. The passive air sampling technique is able to provide data of air concentration levels and spatial and temporal distributions for organochlorine pollutants at both industrious sites as well as clean rural sites.