Chang Keun Song is an Associate Professor at the Department of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), Korea. He completed his BSc, MSc and PhD in Atmospheric Sciences at Seoul National University, Korea. He was a Director (2013-2016) and Senior Researcher (2007-2013) at the National Institute of Environmental Research (NIER). He also has worked as a Post-doctoral Fellow at the University of Huston, US (2004-2006). He has a comprehensive understanding of various air pollution issues and contributes to developing the solutions to handle air quality problems, such as PM2.5 and ozone pollution. He has conducted multi-disciplinary research with many professionals in atmospheric chemistry/engineering, epidemiology, and planning disciplines to derive integrated analyses in finding solutions for real-world air quality problems. He is actively involved with the local and international research community through the American Geophysical Union, European Geophysical Union, Committee on Earth Observation Satellite, Korean Society for Atmospheric Environment, Korean Meteorological Society, Korean Society of Climate Change. He was also involved with international collaborators like US EPA/ORD/OAQPS, US NOAAA/ARL, US NASA/HQ/GSFC Langley, and Japan NIES/CGER, SESR.