United States Department of Transportation
i
Modeling of Concentrations of MSATs (Mobile Source Air Toxics) Along Highways and Near Intersections in Florida
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2011-12-15
[PDF-444.49 KB]
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Abstract:There is a growing concern that emissions of mobile source air toxics (MSATs) from motor vehicles may pose a threat to human health. At present, no agencies require dispersion modeling of these compounds, and until now, highway models that could predict such dispersion did not exist. The widely accepted roadway and intersection model CAL3QHC was modified at the University of Central Florida (UCF) to allow the dispersion modeling of various MSATs at selected large intersections and roadways in Florida. The Environmental Protection Agency (EPA) model MOVES2010a (MOVES) was used to generate MSAT emission factors, and the modified CAL3QHC program (dubbed CAL3MSAT) was used to conduct the modeling. MSAT modeling was conducted at 7 large intersections and 7 large freeway segments in Florida. The year 2010 was used with peak-hour traffic speeds in MOVES to generate emission factors. It is noted that emission factors of MSATs are projected to decrease over the next 20 years, faster than traffic volumes are projected to grow. So the 2010 models produced the highest concentrations, and all future years should have lower concentrations than those modeled in this study. In all of the authors' modeling for all of the intersections and freeway segments in the various FDOT districts, all of the modeled MSAT concentrations were extremely low, leading to the conclusion that MSATs from motor vehicles do not pose a threat to human health in Florida.
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