Air samples were collected at four sites from August 2009 to May 2010. Temporal variation of polycyclic aromatic hydrocarbon concentrations showed the highest concentration in November and the lowest in May, except for one case attributable to a specific meteorological event, a typhoon, which resulted in a dramatic increase in polycyclic aromatic hydrocarbon concentrations. Polycyclic aromatic hydrocarbon compositional pattern, diagnostic ratios, hierarchical cluster analysis, and principal component analysis indicated that the major sources of polycyclic aromatic hydrocarbons in the Gaoping coastal area were local vehicle emissions, stationary sources, and coal/wood combustion. In addition, the distinct compositional patterns at each sampling site suggested that sources of polycyclic aromatic hydrocarbons varied with sampling periods. Back trajectory analysis indicated that transport pathway and moving speed of air parcels were two important factors that influence temporal and spatial variation of polycyclic aromatic hydrocarbon concentrations. Air parcel pathways and polycyclic aromatic hydrocarbon compositional patterns also indicated that polycyclic aromatic hydrocarbons observed at an offshore island (Liu-Chiu Isle) in November were affected by sources in the southwest coastal area of Taiwan. The data set of polycyclic aromatic hydrocarbon concentrations built in this study provides useful information to estimate air-water exchange behavior of polycyclic aromatic hydrocarbons and to investigate the fate of polycyclic aromatic hydrocarbons in the Gaoping coastal area.