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The Thermogravimetry SOF measurement method is developed as simple and time-saving method. It is experimentally revealed that this method is useful for SOF measurement and the method has potential to distinguish SOF component. The oxidation catalysts can effectively reduce particulate matter under actual driving conditions. Sulfate formation suppressing oxidation catalyst reduces high molecular number paraffins. However, it is important for further development of oxidation catalyst to improve the oxidation ability of polar hydrocarbons included in SOF. The oxidation catalysts can effectively reduce CO, HC emissions under actual driving conditions. This is caused by the temperature rise of oxidation catalysts during accelerations.