Spatial and seasonal variations of the chemical, mineralogical and morphological features of quasi-ultrafine particles (PM 0.49) at urban sites.

Combining chemical and physical-structural information of particles is a key issue in PM investigations. Chemical, mineralogical, and morphological characterization of quasi-ultrafine particles (PM 0.49) was carried out at two urban sites of varying traffic-influence (roadside and urban background) in Thessaloniki, northern Greece, during the cold and the warm period of 2013.