alexa A Pilot Study to Identify Factors Affecting UV-B Radiat
ISSN: 2381-8719

Journal of Geology & Geophysics
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Research Article

A Pilot Study to Identify Factors Affecting UV-B Radiation Exposure in Selected Microenvironments

Ted R. Johnson1*, Thomas C. Long2 and William F. Barnard3
1TRJ Environmental, Inc., Chapel Hill, North Carolina 27514, USA
2National Center for Environmental Assessment, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, NC, USA
3Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, North Carolina, USA
*Corresponding Author : Ted R. Johnson
TRJ Environmental, Inc., Chapel Hill, North Carolina 27514, USA
Tel: 919-929-8266
E-mail: [email protected]
Received October 15, 2013; Accepted December 04, 2013; Published December 09, 2013
Citation: Johnson TR, Long TC, Barnard WF (2013) A Pilot Study to Identify Factors Affecting UV-B Radiation Exposure in Selected Microenvironments. J Geol Geosci 3:136. doi:10.4172/2329-6755.1000136
Copyright: © 2013 Johnson TR, 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.


A pilot study was conducted to test a protocol for collecting data useful for identifying local factors affecting exposure to ultraviolet-B radiation (UV-B). A trained technician followed a prepared script through a series of microenvironments representing varying conditions of overhead shielding and ground cover while collecting UV-B irradiance and related data on days selected to represent varying conditions of solar radiation, cloud cover, groundlevel ozone concentration, and fine particulate matter (PM2.5) concentration. The resulting data were combined with air pollution, UV-B, and meteorological data obtained from local fixed-site monitoring stations and analyzed to identify the principal factors affecting (1) UVI (UV Index) measured by the Safe Sun monitor and (2) fixed-site UV-B. Results of these analyses indicated that the best predictors of UVI were degree of shielding, solar angle, fixed-site UV-B, cloud cover, wind speed, time of day, and season. Although cloud cover was an important predictor of UVI, the clearest days did not correspond to the highest UVI values. Variations in cloud parameters can cause intraday UVI variations not reflected in a daily forecast. Residential outdoor microenvironments tended to have lower mean UVI values than outdoor recreation microenvironments (e.g., athletic field, pool), which may have implications for estimating total personal exposure to UV-B.


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