Continuous samples from particle emissions are taken from the dilution duct (non-isokinetic sample) and a second stage dilution with clean and dry air of 20°C is applied before measurements with an Electrical Low Pressure Impactor (ELPI). Number concentration and size distribution of particulate matters are measured in the range of 7 nm to 10 μm and the flow rate of particle emissions (characterized for PM 2.5) are calculated based on the total dilution ratio and the volume flow rate in the dilution duct.