Locally? Definitely. The testing grounds are heavily contaminated with all sorts of radioactive (and possibly otherwise hazardous) material Globally? More diff

Locally? Definitely. The testing grounds are heavily contaminated with all sorts of radioactive (and possibly otherwise hazardous) material Globally? More difficult to estimate. But one example where the environmental impact of nuclear testing can be seen is the contamination of worlds steel supply: https://en.wikipedia.org/wiki/Low-background_steel https://en.wikipedia.org/wiki/Low-background_steel