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Using a sub-grid scale modeling approach to simulate the transport and fate of toxic air pollutants

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Abstract

Several air toxics are emitted from mobile sources on roadways and these emissions account for a significant fraction of the health risks to the population. In addition, health effect studies are now becoming more comprehensive and some account for the spatial heterogeneities of air pollutant concentration fields (as is the case near roadways). Standard models can simulate either the near-source concentration fields or the urban background, but no model can handle both spatial scales in the vicinity of roadways in a coherent and scientifically correct manner. Here, we present a model that provides such an integrated treatment by combining a grid-based air quality model of the urban background with a plume-in-grid representation of roadway emissions. The model is applied to simulate near-roadway concentrations due to emissions from a busy interstate highway in New York City. Qualitative comparisons with typical measured concentration profiles show that the model captures the observed features of toxic air pollutant concentrations near roadways.

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Authors and Affiliations

  1. Atmospheric & Environmental Research, Inc., 2682 Bishop Drive, Suite 120, San Ramon, CA, 94583, USA

    Prakash Karamchandani, Kristen Lohman & Christian Seigneur

Authors
  1. Prakash Karamchandani
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  2. Kristen Lohman
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  3. Christian Seigneur
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Correspondence to Prakash Karamchandani.

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Karamchandani, P., Lohman, K. & Seigneur, C. Using a sub-grid scale modeling approach to simulate the transport and fate of toxic air pollutants. Environ Fluid Mech 9, 59–71 (2009). https://doi.org/10.1007/s10652-008-9097-0

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  • DOI: https://doi.org/10.1007/s10652-008-9097-0

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