Prof. Yoshika Sekine is an expert in the field of environmental chemistry in relation to human health. He graduated from the Faculty of Science and Technology, Keio University and received his PhD in 1993. He is currently working as professor of the Department of Chemistry, School of Science, Tokai University, adjunct lecturer of the Graduate School of Media and Governance, Keio University, and also adjunct lecturer of Kanagawa University of Human Services. After serving as the president of the Society of Indoor Environment, Japan (SIEJ) from 2016 to 2020, he continues to serve as the vice-president of SIEJ for promoting academic activity. He covers a wide range of research topics including observation of atmospheric particulate matters in Asia (China, Korea, Thailand, Myanmar, etc.), development of environmental catalysts for the pollution control of hazardous chemicals, and wellness monitoring via human skin gas analysis. He is currently publishing many original articles on the measurement of trace gases emanating from the human skin surface.