Seasonal factors influencing in chemical composition of total suspended particles at Pune, India

► Aerosol sources and influence of meteorology on aerosol development in the surface layer at Pune, India, are investigated. ► Major source for Ca2+ is soil, for SO42− is industries, for NO3− is vehicles and for NH4+ is animal and human excretion. ► The NH4NO3 molecules are formed through neutralization of HNO3 by NH3 gas on coarse soil particles. ► Seasonal variation in the concentration of aerosol chemical constituents is controlled by seasonally distinct factors. ► Major factors influencing aerosol development at Pune are convection, rainfall activity and temperature inversion.