As the interest on the air pollution is gradually rising up at home and abroad, their vehicle emission regulations are been reinforcing by steps. PM regulation was also reinforced 4times for the last 13years and has been applied to SI vehicles after Euro 5. Additionally, knowing that small particles of PM can easily penetrate deep into lungs PN was added on the regulation from Euro5+ and is applied to CI Vehicles. Also, PN regulation is going to be applied SI Vehicles. But, because the regulation is appled to only a general test mode of each countries that is performed at 25±5℃, it is unclear whether the regulation can work on the other ambient temperature conditions or not. In this paper, to know that PM and PN characteristics at the special conditions 4-vehicle(MPI, GDI, w/DPF, wo/DPF) were tested at 6-ambient temperatures (35, 25, 0, -7, -15 and -25℃) and the PM & PN test results were discussed.