The field emission scanning electron microscopy coupled with energy dispersive X-ray spectrometry (FESEM-EDX) was employed for morphological characterization and elemental microanalysis of individual particles. Size distribution of analyzed particles were found between 0.2 and 1.0 μm which displayed a bimodal distribution in the q-Acc range (0.25–0.50 μm and 0.50–1.0 μm). Soot particles, Tar balls (TBs) and dust particles were classified on the basis of SEM images and elemental composition. Shape descriptor parameters such as circularity (Circularity: 0.62–0.72) and aspect ratio (AR: 1.50–1.88), inferring that particles were not perfectly spherical and not elongated in any uniform direction. Besides, the values of sphericity varied from 0.10 to 2.88 (mean: 1.22) thereby suggesting deviation of the shape (from spherical to non-spherical) in micro-environments. Decreasing trend of roundness and increasing trend of AR with increasing DAeq (Area equivalent diameter) suggest that particles with higher DAeq are more elongated in nature. The value of roundness (RN) varies from 0.18 to 0.98 (mean 0.68) suggesting particle shape varies from nearly perfectly spherical to irregular shape. Furthermore, particles were found to be more spherical in HIG than MIG and LIG which points towards more soot and TBs. The elements such as Si, Mg, Ca and fewer amounts of Al, Fe and K were observed in PM1.0-0.5. While Fe, K, Mg were found in PM0.50-0.25 μm size having crustal origin.