The concentrations of PAHs in $PM_{10}$ fine particles were determined at two sites, which were Jongno, one of the urban core sites of Seoul, and Yongin, a downwind site of Seoul. The average concentration of PAHs in $PM_{10}$ was $19.92{pm}18.49;ng;m^{-3}$ with the range of $1.28{sim}81.22;ng;m^{-3}$ at Jongno site of Seoul from August 2006 to August 2007, and $14.06{pm}9.96;ng;m^{-3}$ with the range of $1.66{sim}31.84;ng;m^{-3}$ at Yongin site from September to November of 2006. In the results of monthly comparison, the concentration of PAHs in August was the lowest level of $3.23;ng;m^{-3}$, but the highest level of $46.24;ng;m^{-3}$ in January. The seasonal comparison showed the concentration in winter was higher by the factor of 11.9 than in summer. The concentrations of PAHs during a warm period (November${sim}$March) increased as 5.1 times higher than those during a cold period (April${sim}$October). The concentrations of PAHs were assumed to be largely attributed to the consumption of fossil fuels, temperature, mixing height, and photochemical reactions in Seoul metropolitan area.