Size distribution of atmospheric aerosols at Maitri, Antarctica

► Fine particles dominate total aerosol number concentrations at Maitri. ► Hourly-averaged aerosol size distributions at Maitri are multi-modal. ► Size distributions of Aitken particles at Maitri may be bimodal also. ► Higher coarse particle concentrations in oceanic than in continental air - masses. ► Nucleation mode appears at 0.01 μm in oceanic and at 0.017 μm in continental air-masses.