Hi,
Two things concerning the Red Sludge disaster in Veszprem country:
We have 4 dead, hundreds injured, and thousands (whole villages) who lost their home and all possessions. The safest way to contribute to aid efforts is by following the instruction on the Hungarian Red Cross website:
www.voroskereszt.hu
(as always, beware the scammers)
On the other hand while the disaster is tragic and devastating in the directly affected area, and the locals deserve all the aid and help people can spare, this is no reason to avoid Hungary altogether.
Containment, neutralization and collection efforts are reported to be effective, and the amount of water in the Danube (~2000 m^3 each second!) simply dilutes the remaining traces of heavy metals beyond recognition.