OAR Policy and Guidance Metarecord
Interstate Air Quality: Reducing Interstate Transport of Fine Particulate Matter and Ozone: Proposed Rule
Interstate Transport of Fine Particulate Matter and Ozone Rule (fact sheet)
|Signed by: Administrator
Signature Date: December 17, 2003
Air Quality Strategies and Standards Division (OAQPS) / Lydia Wegman
Howard J. Hoffman
Proposed & Final Preambles & Rules
EPA Document Number:
electric generating units
air pollution control
The EPA is proposing to find that 29 States and the District of Columbia contribute significantly to nonattainment of the national ambient air quality standards (NAAQS) for fine particles (PM2.5) and/or 8-hour ozone in downwind States. The EPA is proposing to require these upwind States to revise their State implementation plans (SIPs) to include control measures to reduce emissions of sulfur dioxide (SO2) and/or nitrogen oxides (NOx). Sulfur dioxide is a precursor to PM2.5 formation, and NOx is a precursor to both ozone and PM2.5 formation. Reducing upwind precursor emissions will assist the downwind PM2.5 and 8-hour ozone nonattainment areas in achieving the NAAQS. Moreover, attainment would be achieved in a more equitable, cost-effective manner than if each nonattainment area attempted to achieve attainment by implementing local emissions reductions alone.
Based on State obligations to address interstate transport of pollutants under section 110(a)(2)(D) of the Clean Air Act (CAA), EPA is proposing statewide emissions reduction requirements for SO2 and NOx. The EPA is proposing that the emissions reductions be implemented in two phases, with the first phase in 2010 and the second phase in 2015. The proposed emissions reduction requirements are based on controls that are known to be highly cost effective for electric generating units (EGUs). The proposal also discusses model multi-State cap and trade programs for SO2 and NOx that States could choose to adopt to meet the proposed emissions reductions in a flexible and cost-effective manner. The EPA intends to propose the model trading programs in a future supplemental action.