| This paper aims to experimentally study on ultrafine particle emission characteristics of engine exhaust and urban road by using the advanced model 3034 Scanning Mobility Particle Sizer. It can be found that the characteristics of number concentration, mass concentration and size distribution of ultrafine particles of engine exhaust and the exposure degree of ultrafine particles in urban road environment.Firstly, the ultrafine particle emission characteristics were studied on a direct injection two-stroke diesel engine. The impact of the different load, engine rotating speed, injector size and fuel on the number concentration, mass concentration and sixe distribution of the ultrafine particle emissions were investigated. It was shown that the number concentration and mass concentration of the ultrafine particle emissions under different working conditions are not obviously correlated.Secondly, the ultrafine particle emission characteristics were studied...
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