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Acqua inquinata scorre nel Parco nazionale svizzero in Engadina: nello Spöl è infatti stata scoperta un'alta concentrazione di bifenili policlorurati (PCB), che si sono riversati nel torrente in seguito ai lavori sulla diga Punt dal Gall, sul lago di Livigno.
Le autorità grigionesi hanno individuato l'origine dell'inquinamento nei lavori di risanamento dello scarico dello sbarramento e sono in corso delle indagini per appurare chi siano i responsabili.
Il PCB mette in pericolo flora e fauna lungo il torrente, perché si tratta di sostanze poco biodegradabili che si accumulano nella catena alimentare.
ATS/sf
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