Based on the overseas advanced technology, Tongyang succeeded in localizing most of technologies for air pollution prevention equipment through systematically accumulated experiences. Especially, Tongyang has a leading-edge technology in the incinerating facility, VOC reduction system, desulfurizer, DeNOx system and dust collecting system in South Korea. Since the technological transfer for air pollution prevention equipment such as bag filter from Intensiv in Germany, SDR from Bayliss in USA, and RTO (VOC treatment system) from KEU in Germany during the 1990s, Tongyang has established its own and systematic business areas through performing a number of projects. Also, Tongyang localized technologies for air pollution prevention equipment such as combustion gas treatment system, VOC reduction system, desulfurizer/DeNOx system and dust collecting system through continuous R&Ds and various construction experiences.