Abstract: In order to study the source identification of PAHs in Chongqing City, both ambient concentrations and sources of PM₁₀ and PM_2.5 were investigated. Ambient samples were collected from six sites for seven kinds of sources (coal emissions, vehicle exhaust, construction machinery dust, ship exhaust, oil fumes, biomass burning and soil) in spring. In total, 139 ambient samples and 233 source samples were included. Eighteen species of PAHs in the samples were analyzed by GC-MS. Source identification and apportionment of PAHs were investigated by diagnostic ratios, principal component factor analysis (PCA) and chemical mass balance (CMB) receptor model. The results showed that total PAHs concentrations in PM₁₀ and PM_2.5 of Chongqing City ranged from 22.03-31.71 ng/m³ and 19.02-29.92 ng/m³, respectively. Spatial variation showed that the highest total PAHs concentration was at Xinshancun site. 86%-99% of the total PAHs in PM₁₀ were concentrated in particles of PM_2.5, indicating that PAHs were mostly enriched in fine particulates. Source apportionment showed that coal combustion and vehicle emissions were the two major sources for PAHs in PM₁₀ and PM_2.5. For the total PAHs in PM₁₀, vehicle emissions and coal combustion accounted for 25.89% and 32.80%, respectively, while vehicle emissions were the source of a significantly higher percentage, about 62%, of PAHs in PM_2.5.