We live in Alaska. I have blown up so much dtuff and Never heard a word. Neighbors complained but thats it. I blew up a car I didn't like once with fertilizer.....
That being said, My favotite thing to do with extra powder is, find one of the winchester steel round powder cans with the funnel looking top. Cut a hole about 1/4" in the lid, fill with powder, and install a fuse, build a stand so the lid points down, light the fuse, and stand back. if done right it will make a fine rocket, and if it has enough powder they will go out of site.
I even built a few to blow up once they got so high, but I probably shouldn't talk about such things on the interent.