For what it’s worth, most modern fusion bombs actually generate most (e.g. 80%+) of their “yield” from fission—the fusion stage is surrounded by a layer of uranium which is bombarded by neutrons produced in the fusion reaction, causing fission in the uranium and magnifying the yield. So they are pretty dirty weapons. They are at least smaller than the weapons from the 50s and 60s though.
For what it’s worth, most modern fusion bombs actually generate most (e.g. 80%+) of their “yield” from fission—the fusion stage is surrounded by a layer of uranium which is bombarded by neutrons produced in the fusion reaction, causing fission in the uranium and magnifying the yield. So they are pretty dirty weapons. They are at least smaller than the weapons from the 50s and 60s though.