Reuters: Pollution levels from a red sludge spill in Hungary have subsided in the Danube and there is no risk of a biological or environmental catastrophe in the river, Hungarian officials said on Friday. Interior Minister Sandor Pinter told a news conference the spill had not affected the drinking water supply so far and government spokeswoman Anna Nagy said the food chain was safe. Hungary declared a state of emergency in three counties on Tuesday after a torrent of toxic sludge from …