Saying that coal ash is "more radioactive than nuclear waste" is too ambiguous. There are many kinds of nuclear waste with varying degrees of radioactivity. I

Saying that coal ash is "more radioactive than nuclear waste" is too ambiguous. There are many kinds of nuclear waste with varying degrees of radioactivity. I assume there are also variations in the degree of radioactivity in coal ash. It might be meaningful to say that a particular kind of coal ash is more radioactive than a particular kind of nuclear waste, but without that context it's a meaningless comparison.