Nousday,the worldwide studies strongly explain the assocication of particulate Matter (PM),ultra fine particles(VFPs)and human health effects from vehical ‘exhaust in the roadway.The investigation of road usere exposuring to pollutants has been continually studied on the measurement of UFPs and PM inside vehicles.According to the journal named “Atmospheric Environment”,there were some researches about concentrations of air pollution inside vehicle’s cabin as well as the influence of air purifiers equipped inside the cabin.the result presented the particle decline significantly and the desired method of in-cabin air ventilation upon the driver’s decision affect the air pollution inside the vehicle’s caban.However,none of the previous studies indicated the variability of the air purifier efficiency under the different condilions. For more lenowledgement,it is necessary to continue the study on other facturs such as vehicle types, cabin ventilation, vehicle age and second-hand smolce to assess the air purifier influence.