Size resolved aerosol respiratory doses in a Mediterranean urban area: From PM 10 to ultrafine particles.

•Mass doses may be dominated by coarse aerosol deriving from natural sources.•Number and surface area, rather than mass, are controlled by combustion aerosols.•The highest combustion aerosol doses coincide with highest oxidative activities.•The dose deposited on the olfactory bulb is mainly made of combustion UFPs.•Neurodegenerative diseases should be associated to number and surface area metrics.