INFLUENCE OF VEHICLE DYNAMICS ON THE NON-EXHAUST PM-EMISSION PROCESS

We have studied the influence of vehicle speed and meteorological variables on the detected non-exhaust particulate signals by a mobile monitoring system called the Sniffer in the measurement campaign during 2006-2009, in Helsinki. PM10 particulates are decomposed into coarse and fine fractions. The functional forms based on the statistically analyzed data, reveal the dependency of emission factors on vehicle speed and meteorological variables. A clear dependence of the coarse fraction on vehicle velocity is observed and the threshold velocity for the change of slopes of the emission factors and for the relative coarse fraction is suggested.