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Clean Air Markets


CAIR Reduces Iowa’s Emissions

  • By 2015, CAIR will help Iowa sources reduce emissions of sulfur dioxide (SO2) by 7,000 tons or 5 percent.
SO2 Emissions (thousand tons) 2003 2010 2015
Iowa SO2 emissions without CAIR 132 127 135
Iowa SO2 emissions with CAIR N/A 118 125
  • By 2015, CAIR will help Iowa sources reduce emissions of nitrogen oxides (NOx) by 37,000 tons or 49 percent.
NOx Emissions (thousand tons) 2003 2009 2015
Iowa NOx emissions without CAIR 76 76 81
Iowa NOx emissions with CAIR N/A 44 39

CAIR Helps Iowa and its Neighbors

  • Because air emissions travel across state boundaries, reducing the emissions from sources in Indiana also will reduce fine particle pollution and ground-level ozone pollution in other areas of the country.
  • Currently, Iowa sources significantly contribute to fine particle pollution in 2 other states:
        Illinois & Indiana
  • Currently, Iowa sources also significantly contribute to ground-level ozone pollution in:

CAIR Makes Iowa’s Air Cleaner

  • CAIR helps Iowa meet and maintain the National Ambient Air Quality Standards (NAAQS) for ground-level ozone and fine particle pollution.
  • SO2 and NOx contribute to the formation of fine particles (PM), and NOx contributes to the formation of ground-level ozone.
  • Areas meeting the NAAQS are in attainment. Those areas not meeting the standards are known as “nonattainment areas.”

    Fine Particle Pollution

    • At the end of 2004, no Iowa counties were designated nonattainment for EPA’s health-based standards for fine particle pollution.

    Ground-level Ozone

    • At the end of 2004, no Iowa counties were designated nonattainment for EPA’s health-based standards for ground-level ozone pollution.

CAIR is Smart for Iowa’s Economy

  • CAIR helps maintain coal as a viable fuel/energy source.
  • Regional electricity prices are not significantly impacted by CAIR, and are projected to be below 2000 levels.
Average Retail Electricity Prices (AREP) in 1999 dollars 2000 2010 2015
Iowa’s AREP without CAIR (mills/kWh*) 57.4 52.8 49.3
Iowa’s AREP with CAIR (mills/kWh*) N/A 52.9 49.6
    *mill = 1/10 of a cent

1) Partial counties are identified by (P) following the county name.
2) Projections concerning future levels of air pollution in specific geographic locations were estimated using the best scientific models available. They are estimations, however, and should be characterized as such in any description. Actual results may vary significantly if any of the factors that influence air quality differ from the assumed values used in the projections shown here.
3) Small emission increases can occur in a state under CAIR where shifts in power generation occur, but overall improvements occur throughout the CAIR region. The Final CAIR includes a compliance supplement pool of NOx allowances (roughly 200,000 allowances) for the annual program, which could lead to slightly higher annual NOx emissions than are stated here.
4) The data presented here is based on recently completed, revised Integrated Planning Modeling (IPM), reflecting CAIR as finalized. This recent data may differ slightly from modeling results in the Final CAIR Federal Register Notice and Regulatory Impact Analysis (RIA) which were based on modeling that was completed before EPA had determined the final scope of CAIR. The primary difference in the earlier modeling included AR, DE, and NJ in the annual SO2/NOx requirements, and did not include an ozone season cap on any states.
5) Emissions reductions take into account state and federal pollution control programs in place when EPA last updated its models in mid-2004. Reductions from more recent state programs or settlement actions are not reflected in these tables.
6) Retail electricity prices are by North American Electric Reliability Corporation (NERC) region.

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