Jump to main content.


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.

Site Directory

2011-based Modeling Platform (2011v6 Platform)

Particulate Matter (PM) NAAQS (2007v5 Platform)

Mercury and Air Toxics Standards Final Rule

Heavy Duty Greenhouse Gas Rule - Emission Data

Cross-State Air Pollution Rule Final

2008-based Modeling Platform

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

2011-based Modeling Platform

Particulate Matter (PM) NAAQS

Mercury and Air Toxics Standards Final Rule

Heavy Duty Greenhouse Gas Rule - Emission Data

2008-based Modeling Platform (2007v5)

EPA has developed a 2007 modeling platform that is based on data from the 2008 National Emissions Inventory Version 2. 2007 was modeled instead of 2008 due to the nature of the air quality issues in the two years. Many emissions inventories for the 2007v5 modeling platform use 2008 emissions data. The modeling files provided for point sources contain the stack parameters used. The emission inventories for the 2007v5 platform are primarily in the Flat File 2010, also knows as the FF10 format (see definition file below and SMOKE documentation for more information). FF10 files support storing monthly and annual emissions in a single file, and also support hourly and daily point and nonpoint emission inventories. Note that code tables referenced by the inventories can be decoded using the EIS Code Tables.

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.

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.

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.

Emissions Modeling Ancillary Data

Related Links to Emissions Modeling Resources

Training Course - Preparation of Emission Inventories for Modeling

Community Modeling and Analysis System (CMAS) Center Exit EPA Disclaimer

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 Exit EPA Disclaimer
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 Exit EPA Disclaimer
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) Exit EPA Disclaimer
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.

| Office of Air Quality Planning & Standards | Technology Transfer Network |
| Clearinghouse for Inventories & Emissions Factors |


Local Navigation



Jump to main content.