Why are the 23ppm & 70% CO reduction the same for both major and area sources? If there is no difference, why delineate between the two source types?
EPA has different criteria that it considers when setting major and area source limits. Sometimes it turns out that the compliance solution can be the same for similarly sized engines at both major and area sources, but this is not always the case. For instance, existing CI non-emergency engines between 300 and 100 HP have to meet specific CO limits at major sources, while the same engines at an area source would not.
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