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ABSTRACT
The environmental quality of the Valle Orco, partly comprised within the Gran Paradiso National Park, was investigated by evaluation of its epiphytic lichen biodiversity, and the accumulation of radioisotopes in the moss Hylocomium splendens. Three areas with different degrees of environmental quality were identified. A good correlation was observed between sites most exposed to human activities and those with the greatest deviation from environmental quality. Gamma spectrometry revealed the presence of 137Cs, though not at levels posing a threat to health.