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Center for Environmental Excellence | AASHTO
Center for Environmental Excellence | AASHTO
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  • Laws & Agreements
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    • Case Law Updates on the Environment (CLUE)
    • National Environmental Policy Act (NEPA)
    • NEPA Assignment
  • State of the Practice
    • Case Studies
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Air Quality

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DOT Interface for Project-Level Air Quality Modeling

By Amber GarnettJune 28, 2022

State Departments of Transportation (DOTs) conduct project-level air quality analyses for the National Environmental Protection Act (NEPA) and to meet the requirements of the Environmental Protection Agency’s (EPA) transportation conformity…

Risk-Based Comparisons of Alternatives for NEPA

By Amber GarnettJune 10, 2022

Comparisons of alternative build and no-build scenarios in project-level air quality analyses for NEPA and conformity typically focus on comparisons of emissions and/or ambient concentrations of pollutants, namely greenhouse gases…

A Tool For Advancing AERMOD Project-Level Near-Road Air Quality Analysis Based on Satellite Image Maps

By ahardingJune 17, 2021

As the U.S. Environmental Protection Agency (EPA)’s preferred air dispersion model for refined transportation project analyses, AERMOD is used to model roadway “link” source using AREA, VOLUME, LINE, RLINE, or…

MOVES Modeling for Higher Road Grades

By ahardingMay 20, 2021Leave a comment

Emission factors versus speed curves generated using the MOVES3 model exhibit very anomalous behavior at higher road grades that are within the range encountered in project-level air quality analyses for…

Lessons Learned from Project-Level Air Quality Analyses for Particulate Matter

By ahardingMay 20, 2021Leave a comment

Regulatory requirements for conducting quantitative project-level analyses for particulate matter (PM) were introduced by EPA with the release of the MOVES model in 2010. This proposed study would prepare a…

Template for State DOT Guidance for Project-Level Air Quality Analyses

By ahardingMay 20, 2021Leave a comment

The recently completed NCHRP study (20-05 Topic 51-18 Practices for Project-Level Analyses for Air Quality) included a recommendation for the development of a template guidance document for the preparation of…

Resolving Critical Gaps in the Interface Between Travel Models and Emissions Models

By ahardingMay 7, 2021Leave a comment

This research will identify promising analytical techniques that enable four-step planning models, used to produce region-wide estimates of vehicle activity data, to interface with modal emission rate models. The research…

Investigate How VIN Decoder Software can Improve Fleet Mix Data Used in Mobile Source Emissions Modeling

By ahardingMay 7, 2021Leave a comment

Many users of EPA’s MOBILE model are developing regional or local fleet characterization data to more accurately predict mobile source emissions. Vehicle identification number (VIN) decoder software is often used…

Comparative Assessment of the Emissions Impacts of Surface Freight Transportation Modes (truck, rail, water, etc.)

By ahardingMay 7, 2021Leave a comment

TERI Administrator Note (June 2007): Research Need Met FHWA, Assessing the Effects of Freight Movement on Air Quality at the National and Regional Level, Final Report, April 2007 http://www.oregon.gov/ODOT/TD/FREIGHT/docs/publications/federal/FHWAFrtAirQualRep1.pdf Given…

Develop an Ammonia-Related Emissions Component for Inclusion In PART or MOBILE Emissions Models

By ahardingMay 7, 2021Leave a comment

TERI Database Administrator Notes:  Not recommended at present time by 2009 Air Quality Subcommittee.  PART5 calculates exhaust emission factors for primary emitted particulates, brake and tire wear emissions, and re-entrained…

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