Multi-Pollutant Analyses and Technical Support Documents

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Various multi-pollutant proposals designed to reduce emissions from the power sector have been introduced in the Senate this decade. EPA agreed to perform detailed analyses for these legislative proposals starting in 2003 in response to Senate requests. That information, along with analysis of EPA's regulatory approach to reducing emissions from the power sector, is provided on this web site. These analyses are based on air quality, health benefits, and power sector modeling projections and estimates through 2025.

July 2009 EPA Multi-Pollutant Analyses: Alternative SO₂ and NO_x Caps

Additional Resources

January 2009 article on the history and outlook for multi-pollutant control efforts.

Carper Analysis (Powerpoint 4.28 MB)
Carper Analysis Appendix (Powerpoint 2.48 MB)
All State Emissions (Excel 1.78 KB)

Detailed Data Files:

IPM Run - Carper - Scenario 1 (Zip, 4.3 MB)
IPM Run - Carper - Scenario 2 (Zip, 4.3 MB)
IPM Run - Carper - Scenario 3 (Zip, 4.3 MB)
IPM Run - Carper - Scenario 4 (Zip, 4.3 MB)
IPM Run - Carper - Scenario 5 (Zip, 4.3 MB)
IPM Run - Carper - Scenario 6 (Zip, 4.3 MB)
IPM Run - Carper - Reference Case (Zip, 4.3 MB)

October 2005 EPA Multi-Pollutant Analyses

The following legislative proposals were modeled:

Clean Air Planning Act (Carper, S.843 in 108th Congress)
Clean Power Act (Jeffords, S.150 in 109th Congress)
Clear Skies Act of 2005 (Inhofe, S.131 in 109th Congress)
Clear Skies Act of 2003 (Inhofe/Voinovich at the Administration's request, S.485 in 108th Congress)
Clear Skies Manager's Mark (of S.131 above)

In addition, EPA modeled three federal regulations finalized in 2005 as a sixth analysis:

The Clean Air Interstate Rule (CAIR), which covers SO₂ and NO_x emissions in the Eastern U.S.;
the Clean Air Mercury Rule (CAMR), which covers mercury emissions nationwide;
and the Clean Air Visibility Rule (CAVR), which requires certain units - depending on their visibility impacts - to install pollution controls in certain areas of the country.

News release about EPA Administrator Steve Johnson's release of the analyses

Summaries of the Analyses:

Multi-Pollutant Analysis: Comparison Briefing (PDF) (19 pp., 431 K)
Table Summarizing Key Provisions of all Six Scenarios (PDF) (4 pp., 45 K)

The six analyses and additional supporting materials are presented here:

Natural Gas Price Sensitivity Analysis

Fact Sheet: New Natural Gas Price Impacts on EPA's Multi-pollutant Analysis of 2005 (PDF) (2 pp., 20 K)
Mulit-Pollutant Analysis: Natural Gas Price Sensitivity (PDF) (14 pp., 1 MB)

Power Sector Modeling Supporting Materials¹

Technical Support Document - Assumptions for Short-Term Feasibility Constraint (PDF) (29 pp., 5 K)
Technical Support Document - Assumptions for Modeling Demand Response (PDF) (3 pp., 17 K)
Technical Support Document - Description of Allocations Analysis (PDF) (9 pp., 39 K)
Technical Support Document - Analysis of Carbon Dioxide Offsets Provisions of the Clean Air Planning Act of 2003 (S. 843) (PDF) (5 pp., 26 K)
State by State Projections of Emissions and Electricity Prices (Excel, 183 K)
IPM Run - Base Case (Zip, 2.6 MB)
IPM Run - CSA 2005: Inhofe (Zip, 2.4 MB)
IPM Run - CSA 2005: MM (Zip, 2.4 MB)
IPM Run - CSA 2003 (Zip, 2.4 MB)
IPM Run - Jeffords (Zip, 2.9 MB)
IPM Run - Carper (Zip, 3.3 MB)
IPM Run - CAIR/CAMR/CAVR (Zip, 2.7 MB)
IPM Run - Base Case - EIA Gas and Growth (Zip, 2.6 MB)
IPM Run - CSA 2005: Inhofe - EIA Gas and Growth (Zip, 2.5 MB)
IPM Run - CSA 2005: MM - EIA Gas and Growth (Zip, 2.4 MB)
IPM Run - CSA 2003 - EIA Gas and Growth (Zip, 2.4 MB)
IPM Run - Jeffords - EIA Gas and Growth (Zip, 3.1 MB)
IPM Run - Carper - EIA Gas and Growth (Zip, 3.2 MB)
IPM Run - CAIR/CAMR/CAVR - EIA Gas and Growth (Zip, 2.6 MB)
IPM Run - CSA 2005: Inhofe - Demand Response (Zip, 2.6 MB)
IPM Run - CSA 2005: MM - Demand Response (Zip, 2.7 MB)
IPM Run - CSA 2003 - Demand Response (Zip, 2.7 MB)
IPM Run - Jeffords - Demand Response (Zip, 3.3 MB)
IPM Run - Carper - Demand Response (Zip, 3.5 MB)
IPM Run - CAIR/CAMR/CAVR - Demand Response (Zip, 2.8 MB)
IPM Run - CSA 2005: Inhofe - Unconstrained (Zip, 2.4 MB)
IPM Run - CSA 2005: MM - Unconstrained (Zip, 2.4 MB)
IPM Run - CSA 2003 - Unconstrained (Zip, 2.4 MB)
IPM Run - Jeffords - Unconstrained (Zip, 2.9 MB)
IPM Run - Carper - Unconstrained (Zip, 3.2 MB)
IPM Run - Carper - Hard CO2 Cap (Zip, 3.2 MB)
IPM Parsed Files for the years 2010, 2015 and 2020
IPM Documentation

Air Quality Modeling Supporting Materials

Excel Viewer

Note for some of these files, you will need to use the Free Excel Viewer

Technical Support Document - Air Quality Modeling Technique used for Multi-Pollutant Analysis (PDF) (7 pp., 31 K)
Air Quality Modeling Results Excel File (Excel, 669 K)(w/ the following information):
- Projected PM2.5 concentration in each nonattainment area
- Projected Ozone concentration in each nonattainment area
- Projected PM2.5 concentration in each county with a monitoring site
- Projected Ozone concentration in each county in the East with a monitoring site
- Impact on PM2.5 concentrations, by county
- Impact on Ozone concentrations, by county

Benefits Modeling Supporting Materials

Technical Support Document - Health Benefits Extrapolation Method for EPA's Multi-Pollutant Analyses of 2005 (PDF) (6 pp, 29 K)

Carbon Dioxide Provisions of S. 843 Analysis Supporting Materials

2002 EPA Multi-Pollutant Analyses

Multi-Pollutant Legislation Resources

1 For simplification: The Clean Power Act (Jeffords, S.150 in 109th) = "Jeffords", The Clean Air Planning Act (Carper, S.843 in 108th) = "Carper", The Clear Skies Act of 2005 (Inhofe, S.131 in 109th) = "CSA 2005: Inhofe", The Clear Skies Act of 2003 (Inhofe, S.485 in 108th) = "CSA 2003", The Clear Skies Act of 2005 (Manager's Mark of S.131 in 109th) = "CSA 2005: MM", The Clean Air Interstate Rule, The Clear Air Mercury Rule, and The Clean Air Visibility Rule (2005) = "CAIR/CAMR/CAVR."