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The R-LINE Gaussian dispersion model, developed for roadway air quality, is now integrated into AERMOD. It is proposed as a regulatory option for roadway applications in the 2024 Guideline on Air Quality Models.

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Area of Science:

  • Environmental Science
  • Atmospheric Chemistry
  • Air Quality Modeling

Background:

  • The U.S. Environmental Protection Agency (EPA) developed the R-LINE model for roadway air dispersion.
  • Roadway complexities like noise barriers and depressions are addressed by R-LINE.
  • R-LINE has been integrated into AERMOD as the RLINE source type.

Purpose of the Study:

  • To document the development and integration of the R-LINE model.
  • To outline the testing, evaluation, and refinement process of R-LINE.
  • To discuss the proposed regulatory adoption of RLINE for roadway applications.

Main Methods:

  • Gaussian dispersion modeling principles.
  • Integration of R-LINE into the AERMOD modeling system.
  • Testing and evaluation protocols for air dispersion models.

Main Results:

  • Successful integration of the R-LINE model into AERMOD.
  • R-LINE is proposed as a regulatory option for roadway air quality modeling.
  • Future research directions for RLINE have been identified.

Conclusions:

  • The R-LINE model represents a significant advancement in roadway air dispersion modeling.
  • The integration into AERMOD and proposed regulatory status enhance its utility.
  • Continued research will further refine RLINE's capabilities for environmental applications.