Alternative Particle Number Emission Test Method Establishment Particle Number (PN) regulation was firstly introduced for European light-duty diesel vehicles in 2011. Since then, PN regulation has been and is being expanded to heavy-duty diesel vehicles and non-road diesel machineries. PN regulation will also be expanded to China and India around 2020 or later. Diesel Particulate Filter (DPF) and Gasoline Particulate Filter (GPF) are mandatory for the above-mentioned PN regulations. These filter technologies are to be continued to evolve for the near future tighter PN regulation. However, PN emission test for filter technology development is currently and mainly carried out with chassis dynamometer, which is costly and time-consuming. This paper describes a simplified and relatively quicker alternative PN emission test method for accelerating filter technology development compared to the current test method. Point to be noted is that Soot Generator (SG), which is a diesel fuel burner and was originally developed for accelerated soot loading on DPF, is utilized establishing an alternative PN emission test method. SG is proposed for particle source for the alternative test, which allows particle size distribution to be similar to actual vehicles. Another point is testing time reduction by simulating the stage of early filtration where most of the PN leaks through the filter as it occurs on PN emission test with actual vehicle. The result shows high correlation with the PN test on vehicles. Hence, the alternative test method is acceptably applicable, as much quicker test method, in continuous filter technology evolution.