Dr. Hiroshi Okochi is a Professor in the Department of Resources and Environmental Engineering at the School of Creative Science and Engineering, Waseda University, Japan. He specializes in environmental chemistry, focusing on the behavior, transport, deposition, and health effects of airborne micro- and nanoplastics (AMNPs) in various ecosystems, including the atmosphere, soil, and ocean. He leads two major research projects: the Airborne Microplastics and Health Impact (AMΦ) project and the Air-Terrestrial-Marine Interactions and Health Impact of Airborne Micro/NanoPlastics Project (ATM-HAPP). These projects involve long-term and high-altitude field observations in diverse environments such as Mt. Fuji, Chichijima Island, urban forests in Tokyo, and tropical Cambodia. Dr. Okochi is also involved in international joint research with institutions in East Asian countries and Hong Kong, aiming to standardize analysis techniques such as µFTIR-ATR imaging, TOF-MS, and pyrolysis-GC/MS. His research addresses emerging contaminants, including microcapsule-based fragrances and PFAS. He is helping launch a new site on the Sea of Japan side to track airborne microplastics carried across borders and deposited by snow. Dr. Okochi has published numerous peer-reviewed articles and serves as a reviewer for journals such as Environmental Science & Technology and Atmospheric Research.