EPA Defends ‘Interprecursor’ Trading For Complying With Ozone NAAQS

EPA, backed by California air regulators and industry groups, is defending its policy allowing states to use “interprecursor trading” to reduce emissions and help meet federal ozone standards, part of a broader defense of its contested rule for implementing the 2015 ozone standard that environmentalists claim is unlawfully weak. Interprecursor trading allows applicants for air permits to procure offsets via a mixture of reductions in the ozone-forming precursors nitrogen oxides and volatile organic compounds. Environmentalists argue this contravenes Clean Air...