Airborne particulate matter below10and 2.5μm (PM10 and
PM2.5) is the most serious air pollution health risk in many regions of the world (WHO, 2013). According to the last European Environmental Agency report (EEA, 2013), 91 to 95% of urban dwellers in EU are exposed to PM2.5 levels that exceed the reference value set by the World Health Organisation. Traffic exhaust emissions have long been considered as the