Siwatt Pongpiachan is a leading environmental chemist whose work wanders through the microscopic world of aerosols and emerges with insights that reshape policy. He serves as a professor at NIDA in Bangkok, directing the Center for Research & Development of Disaster Prevention & Management and contributing to global networks such as Future Earth. His research spans PM₂.₅, PAHs, heavy metals, and remote-sensing–AI systems for environmental monitoring. He has published extensively, advised Thai ministries and international bodies including OECD and UN agencies, and helped build scientific capacity across ASEAN. His career blends laboratory rigor with policy imagination, always aimed at cleaner, safer skies.