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Emissions Factors Emissions Modeling Clearinghouse 

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. 

2005-Based Modeling Platform

This platform includes emissions data and tools that are in development for supporting future 

EPA analyses. This platform will include support of both criteria air pollutants (CAPs), 

mercury, and other hazardous air pollutants (HAPs) to prepare emissions for air quality 

models. Currently, this platform contains emissions for all inventory HAPs, but does not 

contain the input ancillary files for processing HAPs with the following exceptions: mercury, 

HCl, Cl, and “BAFM” (Benzene, Acetaldehyde, Formaldehyde, and Methanol). SMOKE scripts 

and emissions summaries will be made available at a later date. 

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.

CAP-BAFM 2005-Based Platform, Version 4 

Documentation (in progress) will be provided at a later date 

Data Files (last updated 07/07/2009) 

2005 NEI, version 2 for CAPs and HAPs in SMOKE input format 

All emissions modeling ancillary data files for base-year CAP processing that 

Site Directory 

2005 Based Modeling Platform 

2002 Based Modeling Platform 

2001 Based Modeling Platform 

Emissions modeling software tools 

Emissions modeling ancillary data (Non-inventory 

data) 

Related Links to Emissions Modeling Resources 

Technology Transfer Network 

Clearinghouse for Inventories & Emissions Factors

Last updated on Monday, November 23, 2009

http://www.epa.gov/ttn/chief/emch/index.html#2002

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work with the 2005 v2 NEI, excluding meteorology data. These files are 

provided in SMOKE-ready format only at this time 

Future year scenarios may be provided at a later date 

Microsoft® Excel® summary files (in progress) will be provided at a later date 

Custom SMOKE run scripts (in progress) will be provided at a later date 

2002-Based Modeling Platform

This platform includes emissions data and tools that are in development for supporting future 

EPA analyses. This platform will include support of both criteria air pollutants (CAPs), 

mercury, and other hazardous air pollutants (HAPs) to prepare emissions for air quality 

models. 

Disclaimer: The data available at this time are not necessarily the final data for the 

2002-based platform. EPA may choose to create another version of the 2002 

platform at a later time, without notice.

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

At this location, we also plan to post the following additional information: 

Emissions modeling ancillary files in CSV format 

We also plan to post additional future-year data for 2009 and 2014, but a schedule has not 

yet been set for these. 

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 polluntants 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.

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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 

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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 using a passwordprotected FTP site, Login and password can be obtained from Peter Eckhoff at 

eckhoff.peter@epa.gov. 

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 

prodicts, 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 quaity 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.

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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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