The results of measurements conducted to determine the number and mass concentration of particles emitted from the liquefied natural gas (LNG) fueled spark ignition engines are presented. Particle size distributions were measured at different speeds,different loads and ESC cycles. The nanoparticles with diametersmaller than 39 nm,measured by the electrical low-pressure impactor (ELPI),are dominant in number concentration that is nearly 92.7% of the total number of the emitted particles at the peak point. As for the mass of emission particle,it is shown that the mass of the particles greater than 1.2 μm is more than 65% that of the emitted particles.
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