The present invention relates to an atmospheric pressure plasma generating device, and more specifically, a porous dielectric is inserted between a high voltage electrode and a ground electrode made of a metallic mesh to stably generate plasma at atmospheric pressure and gas is supplied to the high voltage electrode. Atmospheric pressure plasma generating apparatus, characterized in that the plasma is generated between the high voltage and the ground electrode, more preferably, the surface of the porous dielectric on which the high voltage and the ground electrode is installed and the internal pores of the porous dielectric, The purpose is to provide a reaction gas using the same.
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