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Related Experiment Videos

Using a spreadsheet to compute contaminant exposure concentrations given a variable emission rate.

Mark Nicas1, Thomas W Armstrong

  • 1Center for Occupational and Environmental Health, School of Public Health, University of California, Berkeley, CA 94720-7360, USA.

AIHA Journal : a Journal for the Science of Occupational and Environmental Health and Safety
|June 18, 2003
PubMed
Summary

This study presents a numerical method for accurately modeling contaminant exposure by combining variable emission rates with common dispersion models. This approach improves estimations of peak exposure intensity and near-source concentrations.

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Area of Science:

  • Occupational Health
  • Environmental Science
  • Chemical Engineering

Background:

  • Mathematical exposure models rely on emission rates and dispersion patterns.
  • Simple models (constant emission, well-mixed air) can underestimate peak and near-source exposures.
  • Advanced models exist but can be complex and lack closed-form solutions.

Purpose of the Study:

  • To develop a numerical method integrating variable emission rates with common dispersion constructs.
  • To provide a practical implementation using spreadsheet software.
  • To address limitations of simplified exposure modeling.

Main Methods:

  • Numerical method combining variable emission rate functions with three dispersion constructs: well-mixed room, near field/far field, and hemispherical turbulent eddy diffusion.

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  • Implementation via a computer spreadsheet program.
  • Illustration using a sinusoidal contaminant emission rate function.

    • Main Results:

    • The numerical method successfully integrates variable emission rates with standard dispersion models.
    • Spreadsheet implementation provides a practical tool for industrial hygienists.
    • The method accounts for both temporal variations in emissions and spatial concentration gradients.

    Conclusions:

    • The presented numerical method offers a more accurate approach to modeling airborne contaminant exposure.
    • It enhances the assessment of toxicologically significant peak exposures and near-source concentrations.
    • This spreadsheet-based tool can improve occupational exposure assessments.