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MODELING AND MEASUREMENT OF REAL-TIME CO CONCENTRATIONS IN ROADWAY MICROENVIRONMENTS

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http://cfpub.epa.gov/si/si_public_comments.cfm

Citation:

Singh, R. B., A H. Huber, AND J N. Braddock. MODELING AND MEASUREMENT OF REAL-TIME CO CONCENTRATIONS IN ROADWAY MICROENVIRONMENTS. Presented at 93rd Annual Meeting of AWMA Conference, Salt Lake City, UT, June 18-20, 2000.

Impact/Purpose:

The research is planned to meet the following objectives:

Support is provided to HEASD Tasks by Alan Huber. (60% 9524 New Air Toxics Modeling, ; 10% 5732 PM Population Exposure Modeling; 10% 3948 Next Generation MMMP Exposure Modeling; 10% N533 PM Toxic agent exposure modeling, and 10% 3957 Integrated Human Exposure Source-to-Dose Modeling)

  • Development of data and algorithms for exposure modeling in urban areas, to be used in refined probabilistic exposure models being developed elsewhere, to allow prediction of human exposures for an urban population.

  • Characterize exposures and variability of concentrations in critical microenvironments in urban areas using targeted measurement studies and refined air quality models.

  • Identify critical human activities influencing exposures, especially identifying microenvironments that are key to exposures to urban air toxics.

  • Develop methods (measurements, dispersion modeling, receptor modeling) to distinguish exposures to "near field" sources - like indoor sources, human activities or hobbies, or nearby point or area sources - from "background" concentrations or from distant sources that can be modeled well by compartmental or air quality models.

  • Provide data and algorithms based on a scientific understanding of exposure dynamics for inclusion in NERL human exposure models and other models like OAR's TRIM..

    • Description:

    Although emission standards for motor vehicles continue to be tightened, tailpipe emissions continue to be a major source of human exposure to air toxics. The United States Environmental protection Agency's national Exposure Research laboratory has initiated a project to improve the methodology for modeling motor vehicle emissions from source through the pathway to human exposure. A real-time microscale automobile emission factor model for CO (MicroFacCO) virtually capturing all the information in the real world has been developed for United States vehicles. The model was developed for CO because of the available information to support its development. The goal is to use this CO model as a surrogate for other tailpipe air toxic emissions. The mission model is being used in conjunction with roadway dispersion models (e.g.,CALINE4), and being evaluated in the roadways around Research Triangle Park, North Carolina in a range of traffic fleet and meteorological conditions. Modeled concentrations are being compared with measured concentrations inside a moving vehicle and parked vehicle along the roadside. This paper discusses the new emission model, demonstrates the use of the emission model in modeling roadway air concentrations through an example, and discusses the issue and research needs for improving the methodology of modeling human exposures to mobile source emissions.

    Record Details:

    Record Type:DOCUMENT( PRESENTATION/ PAPER)
    Product Published Date:06/18/2000
    Record Last Revised:06/21/2006
    Record ID: 63705