No. Most tests were underground after the first decade or so once the effects of fallout were better understood. Plus underground testing reduces the affected

No. Most tests were underground after the first decade or so once the effects of fallout were better understood. Plus underground testing reduces the affected radius and conserves area for additional testing. Also note that most tests were "small" yield weapons rather than the really big hydrogen bombs. It's easy to forget how large the range of power there is among different nuclear weapons. E.g. Tsar Bomba was 4000 times more energetic than the bomb dropped on Hiroshima.