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Emissions Modeling Clearinghouse

The Emissions Modeling Clearinghouse (EMCH) has been designed to support and promote emission modeling activities both internal and external to EPA. Through this site the EPA intends to distribute emissions model input formatted inventories based on the latest versions of its National Emission Inventory databases. In addition to the emissions data, this site will be used to document and distribute the Agency's latest versions of the ancillary files used to support the temporal, spatial, speciation, and projection of these emissions. Although numerous links to other sources of emissions, modeling factors, and emissions models are available through this site, the EPA does not actively support the use of any one inventory, set of factors, or emissions models for input development to air quality modeling.

Mercury and Air Toxics Standards Final Rule

Regulatory Impact Assessment

• Documentation
• Emissions Modeling for the Final Mercury and Air Toxics Standards Technical Support Document (PDF 98 pp, 154 KB)
• Data files

Appropriate and Necessary finding, national Hg risk analysis

• These data and associated documents are the same as were used for the MATS proposal, since the Hg risk analysis was not remodeled for the final rule.
• Documentation
• Emissions Overview Memo (12/1/2011) (PDF, 10pp 198KB)
• See 2005-Based Platform, Version 4.1 (below) for documentation on 2005
• These two documents summarize the development of the 2005 and focus on 2016 emissions used for the Mercury and Air Toxics Standard proposed rule.
      Proposed Toxics Rule Technical Support Document - Emissions Inventories. (PDF 61 pp, 1784 KB)
      Appendices to the Proposed Toxics Rule Technical Support Document. (PDF 42 pp, 992 KB)
• Memorandum on the Clean Air Mercury Rule Hg speciation factors (PDF 61 pp, 230K)
• Spreadsheet on the Clean Air Mercury Rule speciation factors (XLS 226K)
• Data Files - See 2005-Based Platform, Version 4.1 (below) for data files 2005 and 2016

Appropriate and Necessary finding, non-Hg risk analysis

Information is available on the main MATS page .
Additional Technical Information.

Heavy Duty Greenhouse Gas Rule - Emission Data

• Data Files

2008-Based Modeling Platform (Under Development)

EPA is in the process of developing a modeling platform that will make use of data from the 2008 National Emissions Inventory. EPA is providing early access to emissions modeling-related files that may be of interest to the community. Warning: The posted files may not yet have been used in any modeling projects and unexpected problems may arise when they are used. Note that code tables referenced by the inventories can be decoded using the EIS Code Tables.

• 2008 Emissions Data files

2005-Based Modeling Platform

This platform includes emissions data and tools that are in development for supporting future EPA analyses. This platform includes support for criteria air pollutants (CAPs), mercury, and some hazardous air pollutants (HAPs), and is used to prepare emissions for air quality models. The HAPs supported are HCl, Cl, mercury, and also benzene, acetaldehyde, formaldehyde, methanol (the latter four are known as "BAFM").

The only platform version that should be used for mercury emissions data and modeling is Version 4.1.

Disclaimer: The data available at this time are not necessarily the final data for the 2005-based platform. EPA may choose to create another version of the 2005 platform at a later time, without notice.

Cross-State Air Pollution Rule Final CAP - BAFM 2005-Based Platform, Version 4.2 (do not use for Mercury)

• Cross-State Air Pollution Rule Final Emissions Inventory Documentation
• Emissions Inventory Final Rule Technical Support Document (6/28/2011; pdf 112 pp)
• Appendices for Emissions Inventory Final Rule Technical Support Document (6/28/2011; pdf 46 pp)
• Platform v4.2 README
• Emission Summaries (last updated 6/29/2011)
• 2005 Emissions Data Files
• 2005 emissions for CAPs and selected HAPs in SMOKE input format
• Seasalt Emissions (last updated 6/11/2010)
• Ancillary SMOKE Data Files (last updated 6/29/2011)
• All emissions modeling ancillary data files for 2005, 2012, and 2014 processing in SMOKE-ready format, excluding meteorology data.
• 2012 Emissions Data Files (last updated 6/29/2011)
• 2014 Emissions Data Files (last updated 6/29/2011)
• SMOKE run scripts for the v4.2 platform for 2005, 2012, and 2014 (last updated 6/29/2011)

CAP-BAFM 2005-Based Platform, Version 4.1 (use for Mercury)

• Documentation
• Readme files
• Technical Support Document: Preparation of Emissions Inventories for the 2005-Based Platform, Version 4.1 Platform (3/16/2011; pdf 82 pp)Purpose memo for future year emissions data (4/15/2010)
• Appendices for 2005 Emissions Technical Support Document(3/16/2011; pdf 19 pp)
• 2005 Emissions Data Files (last updated 3/21/2011)
• 2005 emissions for CAPs and HAPs in SMOKE input format
• All emissions modeling ancillary data files for 2005 and 2016 processing, excluding meteorology data. These files are provided in SMOKE-ready format only at this time.
• Seasalt Emissions (updated 3/21/2011)
• Future-year inventory data files
• 2016 emissions data
• 2016 control and projection data in SMOKE input format
• 2005 and 2016 Custom SMOKE run scripts for v4.1 platform (updated 3/21/2011)

CAP-BAFM 2005-Based Platform, Version 4 (do not use for Mercury)

• Documentation
• Readme files
• Purpose memo for future year emissions data (4/15/2010)
• Technical Support Document: Preparation of Emissions Inventories for the 2005-Based Platform, Version 4 Platform (7/7/2010; pdf 72 pp., 0.75MB)
• Appendices for 2005 Emissions Technical Support Document (pdf 13 pp)
• 2005 Emissions Data Files (last updated 6/11/2010)
• 2005 NEI, version 2 for CAPs and HAPs in SMOKE input format
• All emissions modeling ancillary data files for 2005 and 2020 CAP processing, excluding meteorology data. These files are provided in SMOKE-ready format only at this time.
• Seasalt Emissions (updated 6/11/2010)
• 2007 Emissions Data Files (last updated 6/28/2010)
• 2007 daily fires and associated documentation
• Future-year inventory data files
• 2020 emissions data
• 2015 and 2020 control and projection data in SMOKE input format
• 2005 and future year Vehicles Miles Travelled (VMT) for 2005, 2015 and 2020
• Microsoft® Excel® summary files (last updated 4/6/2010)
• Includes summary data for 2005 and 2020
• 2005 Biogenic summary files (Zipped Microsoft® Excel®; last updated 5/11/2010)
• 2005 Custom SMOKE run scripts (updated 6/11/2010)

2002-Based Modeling Platform

This platform includes emissions data and tools that supported EPA analyses. This platform supports both criteria air pollutants (CAPs), mercury, and other hazardous air pollutants (HAPs) to prepare emissions for air quality models.

CAP 2002-Based Platform, Version 3

• Documentation
• Technical Support Document: Preparation of Emissions Inventories for the 2002-Based Platform, Version 3, Criteria Air Pollutants (PDF 77 pp., 0.93MB)
• Appendices for Technical Support Document: Preparation of Emissions Inventories for the 2002-Based Platform, Version 3, Criteria Air Pollutants (PDF 142 pp., 0.97MB)
• EGU Temporal Allocation approach (PDF 14kb)
• Data Files (last updated 1/17/2008)
• 2002 NEI, version 3 for CAPs in SMOKE input format
• All emissions modeling ancillary data files for base-year CAP processing that work with the 2002 v3 NEI, excluding meteorology data. These files are provided in SMOKE-ready format only at this time
• 2009, 2014, 2020 and 2030 emissions data
• Microsoft Excel summary files with both 2002 and future years included
• Custom SMOKE run scripts

Mercury-only 2002-Based Platform, Version 3

• Documentation (in progress)
• Data Files (last updated 1/17/2008)
• CAP NEI files are the same as the CAP-only platform and should be obtained from the CAP 2002-Based Platform, Version 3 described above.
• 2002NEI, version 3 for mercury, chlorine, and hydrochloric acid (HCI) in SMOKE "ORL" input format. These are the pollutants needed for supporting mercury modeling with the current version of the CMAQ model.
• There are no additional ancillary files for this case. All ancillary files to process these emissions should be obtained from the CAP and HAP 2002-Based Platform, Version 3, described below.

CAP and HAP 2002-Based Platform, Version 3

• Documentation
• The 2002-Based Multi-Pollutant Modeling Platform Report, Volume III: Air Toxics (PDF 676KB)
• Appendices (PDF 680KB)
• Data Files (last updated 1/17/2008)
• CAP NEI files are the same as the CAP-only platform and should be obtained from the link above
• 2002 NEI, version 3 for HAPs
• All 2002 SMOKE ancillary data files for base-year CAP-HAP needed in addition to the files provided with the CAP-only platform, excluding meteorology data.
• Custom SMOKE run scripts

2001-Based Modeling Platform

The 2001 modeling platform includes emissions data (but not tools) that were used for previous EPA analyses, as listed below for each platform. Version 2 of this platform supports only CAP emissions, while Version 1 supports both CAPS and mercury.

CAP 2001-Based Platform, Version 2

Includes 2001 and future baseline emissions data used for the EPA analyses shown below. These data files generally do not include rule-specific emissions files for rule-specific base case runs or control strategies. The complete list of rules and RIAs using this version of the platform is:
          - Regulatory Impact Analysis for Final PM NAAQS
          - Regulatory Impact Analysis for Proposed 03 NAAQS
          - Locomotive Marine Rule Proposal (EPA Office of Transportation and Air Quality)
          - Analysis of Clean Diesel programs (EPA Office of Transportation and Air Quality)
          - Section 753 Report of the 2005 Energy Policy Act.

• Documentation
• This platform has been documented in Chapters 1 and 2 of the PM NAAQS Regulatory Impact Assessment, which is available online at http://www.epa.gpv/ttn/ecas/ria.html.
• Data Files (last updated July 2007)
• 2001 NEI for CAPs in SMOKE "IDA" input format
• All emissions modeling ancillary data files for base-year CAP processing that work with the 2001 NEI, excluding meteorology data. These files are provided in SMOKE-ready format only at this time.
• 2015 and 2020 inventories in SMOKE "IDA" input format.
• Data Files in support of 03 NAAQS Proposal RIA
• 2020 Base Case inventory data files specific to 03 NAAQS Proposal RIA

CAP and Hg 2001-Based Platform, Version 1

Includes 2001 and future baseline emissions as well as SMOKE ancillary data. These data were used for the following analyses.
          - Clean Air Interstate Rule (CAIR)
          - Clean Air Mercury Rule (CAMR)
          - Clean Air Visibility Rule (CAVR), commonly known as the "BART" rule
          - Clear Skies Legislation analysis
          - Control of Emissions from Onroad Spark-Ignition Engines and Equipment, Proposed Rule (EPA Office of Transportation and Air Quality)


• Documentation
• The CAP part of this platform has been documented in the CAIR Emissions Inventory Technical Support Document
• The Mercury part of this platform has been documented in the CAMR Emissions Inventory TSD, called Emissions Inventory and Emissions Processing for the Clean Air Mercury Rule.
• Data Files:
• The data files for the CAP part of the platform are available here.
• Mercury data, based on 1999 National Emission Inventory.

Emissions Modeling Ancillary Data

• Latest release ancillary files
Smoke format
CSV format
• Fugitive Dust Fractions
• Temporal Allocation of Emissions
• Spatial Allocation of Emissions
• Chemical Speciation of Emissions
• Emission Projections
• Biogenic Emissions

Related Links to Emissions Modeling Resources

Training Course - Preparation of Emission Inventories for Modeling

Community Modeling and Analysis System (CMAS) Center

The Modeling and Analysis System (CMAS) is an approach for supporting community-based air quality modeling. The CMAS Center distributes and supports features of VMAS for the global modeling community. Its activities include an on-line help desk, model clearinghouse, training, conferences, development assistance for adding new features for the supported CMAS products, model documentation access, model-related research, and a data clearinghouse.

Sparse Matrix Operator Kernel Emissions (SMOKE) modeling system

Emissions modeling system used by EPA to prepare emissions for input to various air quality models. Includes the BEIS3.13 biogenic emissins model.

Emissions Modeling System (EMS), 2001

Emissions modeling system for preparation of emission inventory data from National Inventory Format (NIF) 3.0 for input to air quality models. Includes the BIOME3 biogenic emissions.

Consolidated Community Emissions Processing Tool (CONCEPT)

The new and open source CONCEPT Emissions Processor is under development to support the development of State Implementation Plans for fine particles, regional haze, and ozone by state and local agencies.

Hourly Continuous Emissions Monitoring (CEM) data in SMOKE-ready format.

This site contains hourly CEM data prepared for SMOKE version 2.3 and later for all available CEM data.

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