Yes, it is true, the weather at that time did that big loop thing, taking the bad stuff up to Scandinavia and then eventually looping it back.

Still, some stuff clearly came here, the mushrooms appreciated it.

Unfortunately, I don't have the skills to figure out what was the real impact.

You are correct, things could have been much worse. On the other hand, also as a result of Chernobyl, anything similar is nowadays much less likely.

At the end, it is always a tradeoff. Germany and others turning off their nuclear power stations got themselves in quite an energetic problem. Especially nowadays with all the wars and their consequences.