SourcTO: Adapted from EPA [23].

summer-season NOx emissions by 1.2 million short tons in the affected 22 states and the District of Columbia by 2007 [24].

In addition to promulgating the NOx SIP call, the EPA responded to petitions filed by eight northeastern states under Section 126 of the Clean Air Act. The petitions, known as the Section 126 petitions, request that the EPA make a finding that NOx emissions from certain major stationary sources significantly contribute to ozone nonattainment problems in the petitioning states. The final Section 126 rule requires upwind states to take action to reduce emissions of NOx that contribute to nonattainment of ozone standards in downwind states. The findings affect large electric generating stations and both nonelectric generating boilers and turbines located in 12 northeastern states and the District of Columbia (see Table 4-5 for affected states). Like the NO x SIP call, the EPA has finalized a federal NOZ budget trading program based on application of a population-wide emission rate of 0.15 lb NOx per MM Btu for large electric generating units and a 60% reduction from uncontrolled emissions for large nonelectric generating units. The final Section 126 actions are projected to reduce summer season NOx emissions by 800,000 short tons/year in the affected area [25].

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