Critical Load of Acidity to Surface Waters in Southcentral Ontorario, Canada
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- NIVA-rapport 
The First-order Acidity Balance (FAB) model was applied to 291 lakes in the Muskoka river catchment in Ontario, Canada. Critical loads and exceedances calculated for the region indicate that the portion of the lakes with exceedances dropped from approximately 90% 20 years ago to approximately 40% in the late 1990s.