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L'Ufficio per la natura e l'ambiente (UNA) grigionese ha effettuato misurazioni per accertare l'eventuale presenza della sostanza inquinante organica PCB in tutti i grandi fiumi di valle del cantone, questo come conseguenza dell’inquinamento riscontrato nel tratto superiore del torrente Spöl, a seguito del risanamento della diga Punt dal Gall.
La presenta di PCB, si legge giovedì in un comunicato, è stata esaminata complessivamente in 27 punti. Come atteso, i valori più elevati sono stati misurati nel tratto superiore dello Spöl. Concentrazioni elevate sono state constatate anche nel Reno anteriore al di sotto di Ilanz, nella Plessur al di sopra di Langwies, nei pressi di Litzirüti e nell'Inn al di sotto di Martina.
Negli altri tratti presi in esame i valori rilevati si attestavano a un livello basso. Nei tratti dei corsi d'acqua in cui sono stati rilevati valori di PCB elevati si procederà a esami complementari nel corso del 2018.
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