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Innovative diesel particulates (PM) collection and NOx reduction technology were developed using plasma combined system over the ears. As for PM control, the EHD-assisted electrostatic precipitator (EHD ESP) to collect low resistive diesel PM and the plasma ESP to collect and incinerate PM were developed. As for NOx reduction system, NOx concentration, followed by nitrogen plasma was developed without using catalysts or ammonia used for selective catalytic reduction (SCR). The integrated diesel engine emission component reduction system consists of electrohydrodynamically assisted electrostatic precipitator (EHD ESP), plasma ESP, NOx concentration followed by nitrogen plasma, reactive species injection for NOx and PM reduction, and NOx recirculation EGR system. Each component technology was evaluated and optimized to meet the desired diesel emission control. The integrated plasma combined hybrid system leads to extremely economical and practical NOx removal system.