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This study aims to determine the seasonal variations and composition of suspended particulate matter in different sizes PM_1.0, PM_2.5, PM₁₀ and the total suspended particles (TSP) emitted at major intra-urban traffic intersections (TIs) of Ilorin metropolis. The concentration levels of PM (PM_1.0, PM_2.5, PM₁₀) obtained at the TIs during the rush hours (45.1, 77.9, and 513 μg/m³) are higher than the levels obtained for the non-rush hour periods (42.3, 62.7, and 390 μg/m³). The average on-road respiratory deposition dose (RDD) rates of PM_1.0, PM_2.5 and PM₁₀ during the dry period at TIs types was found to be about 24%, 9% and 25% higher than those obtained during the wet period. Based on EF values calculated, Pb and Zn were anthropogenically-derived while Fe, Mn, Cr, Cu and Mg were of crustal source. Principal component analysis (PCA) has been applied to a set of PM data in order to determine the …