Determination Of Safe Buffer Width Of Roadway To Protect Human Health Form Harmful NOx Exposure

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Title: Determination Of Safe Buffer Width Of Roadway To Protect Human Health Form Harmful NOx Exposure
Author: Bhatt, Hetal H
Abstract: According to the 2004 EPA Trends Report , US on -road transportation sources emit 36 % of nitrogen oxides (NOx ) , 63 % of carbon monoxide (CO ) , and 29 % of volatile organic compounds (VOCs ) . This research determines a safe roadway buffer width to protect human health from air pollutant (NOx ) exposure . The method was used to determine a buffer width for NOx along Great Southwest Parkway in Grand Prairie , Texas . NOx health effects include eye , nose , throat , and lung irritation ; cough ; shortness of breath ; tiredness and nausea . In the Dallas Fort Worth region , where Grand Prairie is located , on -road vehicles contribute over 50 % of NOx emissions . Vehicle NOx emission rates along Great Southwest Parkway were measured using a Horiba 1300 OBS on -board emission measurement system , to determine a maximum 2 .02 g /mile emission factor for the corridor . Hourly DFW meteorological data for a 5 -year period was processed using Cal3qhcr to determine the 10 worst -case meteorological combinations for a 1 -hour averaging time , and the 5 worst for an 8 -hour averaging time . The maximum emission factor and worst -case meteorological conditions were input into the line source dispersion model CALINE4 to determine worst -case concentrations at 5 -m intervals away from the roadway . CALINE4 output was post -processed in Arc View GIS to plot concentrations at receptor locations . Worst -case concentrations were compared to 1 -hour NOx standards implemented in Hong Kong . For the current Great Southwest traffic volume , it was found that 1 -hour NOx standards would not be exceeded . Additional CALINE4 runs were conducted to determine how much the traffic volume could increase , and still avoid exceedances outside a 20 -foot buffer width , which is a common setback distance in residential areas . It was determined that the traffic volume could increase by a factor of 15 and still protect human health from NOx impacts , using a 20 -foot buffer .
URI: http : / /hdl .handle .net /10106 /148
Date: 2007-08-23

Citation

Determination Of Safe Buffer Width Of Roadway To Protect Human Health Form Harmful NOx Exposure. Available electronically from http : / /hdl .handle .net /10106 /148 .

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