As EPA's and states' focus shifts from the agency's recent round of national ambient air quality standard (NAAQS) revisions to implementing the standards, regulators have few viable options for easing the major implementation resource burdens as any significant changes would require Clean Air Act reform that is unlikely in 2013. State regulators and industry sources say EPA has all but exhausted its options to ease implementation of ever-stricter NAAQS under the existing air law. And while some state officials welcome...
