Abstract
It has come as something of a surprise that the Snowdonia National Park, one of the least polluted areas in Europe, is suffering from the effects of acid deposition. A high annual rainfall and a hard geology combine to make the area vulnerable to wind-blown pollutants. The most sensitive ecosystems in the area are lakes and rivers which, showing signs of acid stress, are suffering diminishing salmonid and macroinvertebrate faunas. Upland populations of dippers also appear to be at risk and there is much evidence to show that coniferous afforestation is exacerbating the problems of acidification. There are indications that both broadleaved and coniferous trees are being damaged by acid deposition and certain upland plant communities are at risk. The possible effects on human health are also very worrying. It is the job of the National Park Authority to preserve the landscape of Snowdonia. How do we protect it from acid deposition?
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