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Encouraging the use of alternative fuels available in Thailand is mainly due to fuel crisis within the past few decades. The government has recently drafted a renewable energy long-term plan to increase biofuel production. This has emboldened biodiesel to be used as fuel for agriculture and transportation, in particular. Diesel engines are promising for reducing carbon dioxide emissions related fuel energy consumption. Ordinarily, diesel combustion generates particulate matter and nitrogen oxides in trade-off relationship. However, advanced techniques for engine technology and aftertreatment devices have been abundantly developed to mitigate these hindrances. To break the trade-off emissions, an example technique is to fuel engines with biodiesel incorporated with exhaust gas recirculation. Among available options, nonthermal plasma (NTP) is one of the techniques that charges exhaust gas with high power electricity to reduce some emissions.