Toshimasa Ohara is Researcher Director of the Fukushima Branch at the National Institute for Environmental Studies (NIES). He leads the Environmental Emergency Research Program that contributes to environmental recovery and renovation in Fukushima. After the Fukushima accident his group worked on atmospheric simulations of radionuclides from the disaster, and published the first result of temporal and spatial variations of deposition rates on a regional scale. He is President of the Japan Society for Atmospheric Environment and serves as a member of the Science Advisory Committee of the Acid Deposition Monitoring Network in East Asia (EANET).