Abstract
IN THE THREE MONTHS since a federal court unexpectedly threw out a 2005 regulation controlling emissions from power plants, signs are clear that the air could get dirtier. It is hazy, however, just what utilities and affected states will do in the wake of this decision. Coal-fired utilities are pondering whether they will operate the pollution control equipment they have installed to comply with the defunct regulation. At issue for these utilities is whether to run these devices—which cost money—now that they are no longer required to do so. The 28 eastern states affected by the now-dead Environmental Protection Agency regulation are scrambling to reconfigure their plans for meeting federal air quality limits on ground-level ozone and particulate matter. State regulators were relying on the overturned rule for big cuts in emissions of nitrogen oxides (NO x ), which are precursors to ozone, and sulfur dioxide, which contributes to particulates. Ozone and particulate pollution cause health ...
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