alexa Determination of Safe Roadway Buffer Width to Protect Human Health from NO2 Exposure: A Case Study for Grand Prairie, TX
ISSN: 2165-784X

Journal of Civil & Environmental Engineering
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Research Article

Determination of Safe Roadway Buffer Width to Protect Human Health from NO2 Exposure: A Case Study for Grand Prairie, TX

Saravanan G1*, Antony Jeyasehar C2, Salahuddin M3 and Kandasamy S4
1Assistant Professor, Department of Civil Engineering, A. C. College of Engineering and Technology, Karaikudi, India
2Professor& Head, Department of Civil and Structural Engineering, Annamalai University, Annamalainagar, India
3Director, Clean Technology Division,Ministry of Environment& Forest, Govt. of India, New Delhi, Inida
4Professor, Department of Civil Engineering, A.C.College of Engineering and Technology, Karaikudi, India
Corresponding Author : G. Saravanan
Assistant Professor
Department of Civil Engineering
A. C. College of Engineering and Technology
Karaikudi, India
E-mail: [email protected]
 
Received December 12, 2012; Accepted March 15, 2013; Published March 25, 2013
 
Citation: Saravanan G, Antony Jeyasehar C, Salahuddin M, Kandasamy S (2013) Flyash Based Geopolymer Concrete: A State of the Art Review. J Civil Environ Eng 3:126. doi: 10.4172/2165-784X.1000126.
 
Copyright: © 2013 Saravanan G, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

According to the U.S. Environmental Protection Agency (EPA), in 2010 mobile sources in the U.S. contributed
58% of carbon monoxide (CO), 56% of nitrogen oxide (NOx), and 33% of Volatile Organic Compounds (VOCs). Onroad
sources also emit a variety of air toxics, including benzene, toluene, and xylenes. The case study presented here
determines a safe roadway buffer width to protect human health from nitrogen dioxide (NO2) exposure along an arterial
in Grand Prairie, Texas. NO2 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
about half of NOx emissions.
Vehicle NOx emission rates along Great Southwest Parkway were measured using a Horiba 1300 OBS onboard
emission measurement system, to determine a maximum 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 hourly
meteorological combinations. The maximum emission factor and worst-case meteorological conditions were input into
the line source dispersion model CALRoads View to determine worst-case NO2 concentrations at 5- m intervals away
from the roadway. CALRoads View output was post-processed in Arc View GIS to plot concentrations at receptor
locations.
Worst-case concentrations were compared to the 1-hour NO2 National Ambient Air Quality Standard (100 ppb). For
the current Great Southwest traffic volume, it was found that the standard would not be exceeded. Additional CALRoads
View 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 10 and still protect human health from NO2 impacts, using a 20-foot buffer.

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