The impact-oriented critical load approach to SO2 emission reduction strategy

The Impact-Oriented Critical Load Approach to SO2 Emission Reduction Strategy Critical Load Calculations 

As applied to aquatic ecosystems in eastern Canada, critical load is defined as the amount of wet sulfate deposition that must not be exceeded in order to protect at least 95% of lakes in a region from acidifying to a pH level of less than 6.0 (Ro et al., 1997). 

Recent studies suggest that pH of 6.0 is needed to protect most aquatic organisms (see Table 2). 

It is worth noting that, with this definition of critical load  

The critical load concept was applied to eastern Canada for two reasons, mainly  

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The impact-oriented critical load approach to SO2 emission reduction strategy Critical load calculations... 

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