Emissions Modeling Clearinghouse
Fugitive Dust Fractions

BACKGROUND

Grid air quality models consistently overestimate fugitive dust impacts as compared to ambient samples. The following is documentation and example calculations of the transport fraction, a newly developed methodology to reduce fugitive dust emissions for use in grid modeling analyses. It is considered a logical step to improve our ability to account for the removal of particles near their emission source by vegetation and surface features and can be useful in grid-based modeling analyses. It is suggested as a replacement for the "divide-by-four" approach sometimes used to adjust fugitive dust emissions for grid modeling.