The Theory and Mathematical Development of AIRPOL-4

Report No: 75-R49

Published in 1975

About the report:

This is the first in a series of reports documenting the Virginia Department of Highways & Transportation line source model for predicting carbon monoxide concentrations within the microscale environments of highways. The purpose of this first report is to provide a detailed introduction to and verification of the theoretical development of AIRPOL-4, a true Gaussian formulation enhanced by several theoretical and computational innovations. These innovations establish AIRPOL-4 as a major advancement in the field of air quality modeling. Specifically, the mathematical development of the conceptual aspect of the model demonstrates AIRPOL-4's ability to correctly analyze 1. receptors upwind of a roadway, 2. all wind speeds > 0, 3. any sampling interval, 4. urban environments, 5. all traffic speeds > 0, and 6. at grade, cut, and fill geometries. Furthermore, the algorithmic development of the model firmly establishes AIRPOL-4's position as a very efficient and very accurate model. The second report in this series provides the definitive experimental evidence of AIRPOL-4's prepotent predictive performance and cost effectiveness.

Disclaimer Statement:The contents of this report reflect the views of the author(s), who is responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the Virginia Department of Transportation, the Commonwealth Transportation Board, or the Federal Highway Administration. This report does not constitute a standard, specification, or regulation. Any inclusion of manufacturer names, trade names, or trademarks is for identification purposes only and is not to be considered an endorsement.


Other Authors

William A. Carpenter, G. G. Clemeña

Last updated: February 5, 2024

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