No, Hiroshima is not still radioactive today. Radiation levels in Hiroshima are comparable to the natural background radiation found anywhere else on Earth, making the city safe for residents and visitors. Most of the initial dangerous residual radiation decayed rapidly within days and weeks. Additionally, typhoons that struck the city shortly after the bombing helped wash away contaminated soil and debris, further reducing radiation levels. Unlike ground-level nuclear disasters, the atomic bomb dropped on Hiroshima was an airburst, resulting in significantly less fallout.