Research for the AASHTO Standing Committee on the Environment. Task 96. Quick Reference Guide for Traffic Modelers for Generating Traffic and Activity Data for Project-Level Air Quality Analyses

There is a frequent disconnect between the traffic data needed for project-level air quality analysis and the traffic data provided by traffic modelers. The disconnect leads to waste in processing and time and introduces project risk by introducing uncertainty into the National Environmental Policy Act (NEPA) and Transportation Conformity process. The challenge stems from different technical vocabulary and knowledge-base of air quality and transportation modelers.  State departments of transportation (DOTs) need guidance that can bridge the gap between air quality and traffic modelers by articulating air quality needs with an understanding of common language and tools available to traffic modelers.  The purpose is not to create a new process for AQ but to improve communication between disciplines and build upon the recently completed NCHRP project 25-38, “Input Guidelines for Motor Vehicle Emissions Simulator Model”. The objective of this research is to supplement the recently completed NCHRP Report 765, "Analytical Travel Forecasting Approaches for Project-Level Planning and Design" by providing guidance focusing specifically on generating traffic information for air quality analysis.  This research effort will aid traffic modelers in understanding the traffic data needed for air quality analysis and contribute to improved accuracy and efficiency of the traffic and activity modeling that is necessary to complete federally required air quality analysis by providing guidance to modelers to help them develop data in format that can be easily used by air quality analysts. NCHRP Report 765 addressed the general subject of project-level modeling in detail but does not address needs specific to project-level air quality analyses. The amount and complexity of air quality data needs varies by location, modal components, pollutant, context (e.g., stakeholder concerns). Guidance would need to consider all these variables along with traffic data considerations for when air quality mitigation includes operational changes to traffic.


  • English


  • Status: Active
  • Contract Numbers:

    Project 25-25, Task 96

  • Sponsor Organizations:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    American Association of State Highway & Transportation Officials

    444 North Capitol Street, NW, Suite 225
    Washington, DC  United States  20001

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001
  • Project Managers:

    Hartell, Ann

  • Performing Organizations:

    Parsons Brinckerhoff

    2545 Farmers Dr. Suite 350
    Columbus, OH  United States  43235
  • Principal Investigators:

    Ginzburg, Helen

  • Start Date: 20151104
  • Expected Completion Date: 20180301
  • Actual Completion Date: 0
  • Source Data: RiP Project 39794

Subject/Index Terms

Filing Info

  • Accession Number: 01566285
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 25-25, Task 96
  • Files: TRB, RiP
  • Created Date: Jun 13 2015 1:00AM