You could clearly see the plume going twice as far (as NZ) into the Pacific on the satellite photos. Apparently it made it as far as South America. Once it gets

You could clearly see the plume going twice as far (as NZ) into the Pacific on the satellite photos. Apparently it made it as far as South America. Once it gets into the upper atmosphere, the jet streams and currents take it far. That said, it probably has little impact on humans when its that high up.