Well we’ve done 2 over cities closely spaced with each other and also following a firebombing campaign that burned a lot more cities. If a burning city or fores

Well we’ve done 2 over cities closely spaced with each other and also following a firebombing campaign that burned a lot more cities. If a burning city or forest was all that was required for a nuclear winter we’d have had one long ago. Forests burn without the aid of nuclear weapons. To get to nuclear winter levels of ash and dust you probably need dozens to hundreds of detonations and burning cities.