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Dissertation
Rural air quality and respiratory health
University of Iowa
Doctor of Philosophy (PhD), University of Iowa
Spring 2012
DOI: 10.17077/etd.h56uu0rc
Abstract
<p>Chapter II describes results from 197 rural households that were sampled over five continuous days for indoor and outdoor PM10, PM2.5, and endotoxin. Geometric mean indoor concentrations of PM10 and PM2.5 (21.2 πg m-3, 12.2 πg m-3) were larger than outdoor concentrations (19.6 πg m-3, 8.2 πg m-3; p =0.072, p<0.001). While geometric mean endotoxin levels were almost six times larger in outdoor air compared to indoor (1.47 EU m-3, 0.23 EU m-3; p <0.001). Airborne PM10 and endotoxin concentrations in a rural county were elevated compared to those previously reported in certain urban areas. Furthermore, during the harvest season, concentrations of endotoxin in ambient air approached levels that have been shown to cause decreased respiratory function in occupational workers. Chapter III evaluated the effectiveness of using Radiello passive monitors to measure hydrogen sulfide (H2S) in close proximity (<40 m) to a medium sized CAFO. A total of eight passive H2S monitors were deployed 7-14 days around a swine confinement for seven months. Additionally, a separate laboratory study was carried out to determine the monitor's H2S uptake rate. Concentrations of H2S measured near the confinement were varied and ranged from 0.6 to 95 ppb depending on the sampling period and proximity to the lagoon .The uptake rate provided by the supplier (0.096 ng ppb-1 min-1) was significantly larger (p=0.002) than the rate determined experimentally (0.062 ng ppb-1 min-1). In Chapter IV we evaluated the association between residential proximity to swine operations and childhood asthma. A metric was created to determine children's relative environmental exposure to swine CAFOs which incorporated facility size and distance and direction of the CAFO to the home. When controlling for six significant asthma risk factors, children with a larger relative environmental exposure to CAFOs had a significantly increased risk of physician-diagnosed asthma (OR=1.20, p=0.009). In stratified analysis that adjusted for a respiratory infection before the age of two years, the association between relative exposure and childhood asthma was significantly increased in children with a respiratory infection (OR=1.45, p=0.001) but not in children free from respiratory infection (OR=1.12, p=0.355).</p>
Details
- Title: Subtitle
- Rural air quality and respiratory health
- Creators
- Brian Thomas Pavilonis - University of Iowa
- Contributors
- Patrick T. O'Shaughnessy (Advisor)Wayne T. Sanderson (Committee Member)Renee Anthony (Committee Member)Dale L. Zimmerman (Committee Member)Peter S. Thorne (Committee Member)
- Resource Type
- Dissertation
- Degree Awarded
- Doctor of Philosophy (PhD), University of Iowa
- Degree in
- Occupational and Environmental Health
- Date degree season
- Spring 2012
- Publisher
- University of Iowa
- DOI
- 10.17077/etd.h56uu0rc
- Number of pages
- vii, 103 pages
- Copyright
- Copyright 2012 Brian Thomas Pavilonis
- Language
- English
- Description bibliographic
- Includes bibliographical references (pages 94-103).
- Academic Unit
- Occupational and Environmental Health
- Record Identifier
- 9983777274802771
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