Concentration of zinc, copper, aluminium, iron in Szamos River below threshold
The authority earlier reported above-threshold values of zinc, copper, aluminium and iron in samples taken early on Thursday.
OKF said in a statement that it would continue monitoring any changes in the environment.
The national water management authority (OVF) said on Wednesday that it had been alerted of heavy metal pollution arriving in Hungary in the River Szamos from Romania. The Romanian side had sent information over the Principal International Alert Centre (PIAC) showing that heavy metal pollution resulting from mining spoil was expected to arrive in Hungary. The pollution reached Hungary at 1am on Thursday.