- The document discusses the application of two state-of-the-art air dispersion models, AERMOD and ADMS, to assess compliance with new air quality requirements at Nanticoke Generating Station near Lake Erie and Lake Ontario. - The models were used to model SO2 emissions from eight coal-fired power generation units and produced significantly different outputs due to their different treatment of key parameters like Monin-Obukhov length and boundary layer depth. - Model selection was found to strongly influence the identification of compliance parameters and therefore the cost of achieving compliance. ADMS also offers a shoreline module that AERMOD currently lacks.