Implications of the Implementation of the MOBILE6 Emissions Factor Model on Project-Level Impact Analyses Using the CAL3QHC Dispersion Model
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Implications of the Implementation of the MOBILE6 Emissions Factor Model on Project-Level Impact Analyses Using the CAL3QHC Dispersion Model

Filetype[PDF-1.81 MB]


English
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Details:

  • Creators:
    Carr, Edward W.
  • Corporate Creators:
    ICF Inc.
  • Contributors:
  • Corporate Contributors:
    United States. Federal Highway Administration. Office of Natural and Human Environment
  • Subject/TRT Terms:
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    United States
  • Edition:
    Final Report
  • Corporate Publisher:
    Federal Highway Administration (U.S.)
  • Abstract:
    Across the country, most Metropolitan Planning Organizations’ (MPOs) and state Departments’ of Transportation (DOTs) staff have begun to use MOBILE6 in project-level dispersion modeling. As a result, a goal for this project was to inform practitioners in the transportation community about the most critical and sensitive input parameters to MOBILE6 affecting projectlevel transportation and air quality analyses so that resulting transportation decisions are improved. The results of this project provide transportation planners with information that can help them develop cost effective strategies for using MOBILE6 in project-level dispersion analyses and to help design mitigation strategies when hotspot modeling is needed. The CAL3QHC roadway intersection model is typically employed to determine potential air quality impacts for project-level analysis. CAL3QHC uses both an idle emission factor and an appropriate emission factor based on each link’s free flow speed. The recent changes incorporated in MOBILE6 may produce changes in the idle and free-flow speed emission rates. Because these two emission rates are the input parameters for CAL3QHC, the modeling output may be different using MOBILE6 versus earlier versions of MOBILE. Overall the study explores how the use of MOBILE6 impacts project-level analyses. The study is divided into three main components addressing the following three questions:

    • How will changes in MOBILE6 impact project-level results?

    • How will changes in MOBILE6 affect the process for project-level analysis?

    • Will changes in MOBILE6 significantly impact screening assessment procedures?

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