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Models and Analysis Tools

Models and tools can be used to measure and compare costs and benefits resulting from transportation activities and control measures, the application of new vehicle technologies, or using new transportation fuels.

ACRP Report 11: Guidebook on Preparing Airport Greenhouse Gas Emissions Inventories (April 2009) (PDF 1.72mb)

Transportation Research Board

ACRP Report 11: Guidebook on Preparing Airport Greenhouse Gas Emissions Inventories provides a framework for identifying and quantifying specific components of airport contributions to greenhouse gas emissions (GHG). This guidebook can be used by airport operators and others to prepare an airport-specific inventory of greenhouse gas emissions. It identifies calculation methods that can be applied consistently, improving comparability among airports and enhancing understanding of relative contributions of greenhouse gases to local environments. The inventory methods presented focus on the six primary greenhouse gases: carbon dioxide, methane, nitrous oxide, sulfur hexafluoride, hydrofluorocarbons, and perfluorocarbons. As part of the methodology, the guidebook provides instructions on how to calculate emissions from specific sources and how to create carbon dioxide (CO2) equivalencies.

Climate Leadership in Parks (CLIP)

(Currently not publicly available)

U.S. Environmental Protection Agency

This tool calculates emissions based on fuel consumption and/or vehicle miles traveled and thus allows for greenhouse gas (GHG) and criteria pollutant emissions estimation at a more local level.

Intelligent Transportation Systems Deployment Analysis System (IDAS)

Federal Highway Administration

This sketch planning analysis tool is used to estimate the impacts, benefits, and costs resulting from the deployment of Intelligent Transportation System (ITS) components of over 60 types of ITS investments.

Long Range Energy Alternatives Planning (LEAP) System

Commend: Community for Energy, Environment and Development

LEAP is a software tool for energy policy analysis and climate change mitigation assessment that uses integrated modeling to track energy consumption, production, and resource extraction in all sectors of an economy.


U.S. Environmental Protection Agency

MOBIL6 is used to produce motor vehicle emission factors for use in transportation analysis and can be used at any geographic level within the U.S.

National Mobile Inventory Model (NMIM)

U.S. Environmental Protection Agency

NMIM uses current versions of MOBILE6 and NONROAD to calculate emission inventories, based on multiple input scenarios that users can enter into the system, and can be used to calculate national or individual state or county inventories.


U.S. Environmental Protection Agency

This model produces estimates of criteria pollutant emissions and CO2 from all non-road sources, with the exception of commercial marine vessels, locomotives, and aircraft. The model calculates past, present, and future emission inventories for 80 basic and 260 specific non-transportation equipment categories.

Recommended Practice for Quantifying Greenhouse Gas Emissions from Transit (PDF 976kb)

American Public Transportation Association

This Recommended Practice provides guidance to transit agencies for quantifying their greenhouse gas emissions, including both emissions generated by transit and the potential reduction of emissions through efficiency and displacement by laying out a standard methodology for transit agencies to report their greenhouse gas emissions in a transparent, consistent and cost-effective manner.

World Energy Protection System (WEPS) Transportation Energy Model (TEM)

U.S. Department of Energy

This structural accounting model for transportation energy use generates mid-term forecasts of the transportation sector's energy use in order to evaluate the effect of changes in fuel economy on carbon emissions.

Updated: Thursday, March 30, 2017
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