Thesis (M.A.)--Georgia State University, 2008. / Title from file title page. Arla Bernstein, committee chair; Yuki Fujioka, Jaye L. Atkinson, committee members. Electronic text (62 p.) : digital, PDF file. Description based on contents viewed Sept. 25, 2008. Includes bibliographical references (p. 55-59).

Thesis (M. S.)--Civil and Environmental Engineering, Georgia Institute of Technology, 2009. / Committee Chair: Guensler, Randall; Committee Member: Rodgers, Michael; Committee Member: Ross, Catherine. Part of the SMARTech Electronic Thesis and Dissertation Collection.

The Atlanta Beltline is an urban redevelopment project that was designed to increase access to trails, parks, and greenspace in Atlanta, Georgia. Thirty-three miles of new trail will be developed, providing a place for the community to engage in purposeful physical activity and active transport around the city of Atlanta. Because physical activity is associated with improvements in birth outcomes and under the assumption that close proximity to the Atlanta Beltline encourages physical activity, I hypothesize that women residing within 0.5 mile of the Atlanta Beltline will show improvements in birth outcomes, as compared to women residing 1-1.5 miles away from the Beltline. Birth outcomes were measured as rates for low birth weight, premature live birth, and fetal mortality rates. Census tract data for birth outcomes for the time period “pre-Beltline,” 2002 - 2007, and “post-Beltline,” 2008 - 2012, was obtained from Georgia Department of Public Health. 18 census tracks in three areas along the Beltline (Northside, Eastside, West End) were identified as exposed and 17 in the same areas were unexposed. We found the following mean rates (SDs) of the outcomes in the exposed census tracks during the pre-Beltline period: 119.22 (48.39) low birth weight, 154.94 (55.80) premature birth, and 16.17(15.81) fetal death, all per 1,000 live birth. During the post-Beltline period in the exposed area, these measurements were: 107.55 (39.66) low births weight, 131.06 (48.92) premature birth, and 12.28 (13.51) fetal death, all per 1000 live birth. In the unexposed census tracks during the pre-Beltline period, mean rates (SDs) of the outcomes were 110.82 (42.81) low births weight, 144.88 (46.49) premature birth, and 19.94 (35.45) fetal death, all per 1000 live birth. During the post-Beltline period, these measurements in the unexposed area were: 100.88 (40.76) low births, 134.17 (47.85) premature birth, and 8.06 (6.89) fetal death, all per 1000 live birth. Overall in both the exposed and unexposed areas, the time trends for the examined measurements of birth outcomes were towards improvement; however, only a decrease in premature live birth in the exposed area (p=0.2) and fetal mortality in the unexposed area (p=0.1) were of statistically marginal significance. We conclude that currently no significant improvements in birth outcomes, associated with close proximity to the Atlanta Beltline have been detected.

Background: Adolescents and young adults aged 15 to 24 acquire nearly half of all new STDs in the United States, yet they represent only 25% of the sexually active population. Young men and women in this age group have the highest rates of chlamydia, gonorrhea, and syphilis, especially in the African American population. Adolescent risk factors include having a history of pregnancy or STDs, being arrested or incarcerated, substance abuse, early sexual debut and having 4 or more lifetime sexual partners. Protective behaviors such as parental involvement, school enrollment, and consistent condom use have been associated with decreased incidence of STDs. The purpose of this study is to observe changes in adolescent behaviors and experiences that are known risk factors for acquiring sexually transmitted diseases. The aim is to identify the time at which STD prevention interventions may be administered most effectively. In addition, the study aims to identify relevant themes and content that may be useful in creating interventions targeted to different age groups and genders. Methods: This study utilizes primary data collected between 1999 and 2003 by Dr. Rothenberg and colleagues for a community-based network study of low-income African American adolescents living in a working class neighborhood in Southwest Atlanta. Two descriptive analyses were conducted: a period analysis in which all participants ages 15 to 18 who completed any or all of three interviews were included; and a cohort analysis, which included only participants who completed three interviews and who were 15, 16, 17 or 18 years of age at the time of the first interview. Univariate analysis was used to describe each variable and the resulting frequencies and percentages were reported. Results: In both period and cohort analyses, higher proportions of older adolescents (ages 17 and 18) reported engaging in risky behaviors including drinking alcohol, using marijuana, having sex and having multiple sexual partners, compared to younger adolescents (ages 15 and 16). Males reported higher proportions of engaging in risky behaviors than females, but also higher proportions of condom use. The proportion of participants diagnosed with one or more STDs decreased at each interview. In the cohort analysis, the proportion of participants who perceived their STD risk as “medium” or “high” increased over time. Conclusions: The findings suggest that as adolescents mature they engage in a greater variety of risky behaviors known to have a positive association to STD diagnosis. Period analyses, which have usually been done to study the sexual behaviors of adolescents, may give aberrant results that are clearer when the population is studied as a cohort. Future studies are needed to more precisely identify the period during which adolescents experience rapid changes in their risk behaviors.

Atlanta is one of the largest metropolitan areas in the southeastern United States and is the only area in the region currently listed in “serious” 1-hour ozone nonattainment. Despite its exceedance history, impacts on Atlanta’s urban forests have not been the focus of any major studies. The purpose of this study was to examine air pollution damage to vegetation using a foliar-injury survey on Stone Mountain. The objectives of this project included 1) establishing that pollution transport from Atlanta to Stone Mountain occurs, 2) determining the magnitude of ozone concentrations near Stone Mountain and 3) assessing sensitive plant species on Stone Mountain for foliar injury. Results from this study confirm that Stone Mountain is located downwind from Atlanta. Ozone concentrations were sufficiently high to damage vegetation and these consistently peaked in July. Foliar injury was present on understory species on Stone Mountain, but was not observed on loblolly pine species.

Urban areas contain multiple sources and sinks of carbon dioxide, yet spatial and temporal information explaining its variability, diurnal patterns, and effects from human activity are limited. The city of Atlanta, due to conflicting air masses, geographic location, and population growth, is as an excellent location to study carbon dioxide concentrations across its urban landscape. Mobile measurements of ambient CO2 concentrations were obtained at 1.5m above ground level along a transect in winter 2010 within the perimeter of Atlanta. Analyses of winter 2010 CO2 variability at GSU’s stationary CO2 monitor was also explored. The results showed that CO2 concentrations in Atlanta are highly variable. The GSU CO2 station showed that weekday CO2 concentrations to be significantly higher than weekends suggesting that anthropogenic emissions may be the cause.

From 2000 to 2007, the five core county area of Metropolitan Atlanta (Fulton, Dekalb, Clayton, Cobb and Gwinnett) experienced 1,871 incidents involving child pedestrians. Nearly one-third of these incidents occurred during school-commuting hours. This study examines the geospatial locations of these incidents, with regards to the location of all 647 public schools within the study area. A GIS is used to analyze the spatiotemporal arrangement of these incidents in order to find risk factors and patterns in the data. Aspects of the built environment are then considered in areas with higher frequencies of child pedestrian-vehicle incidents. A walkability assessment is conducted to assess risk factors involved in the increased incident frequencies in an area of Stone Mountain. A correlation with the location of parks, recreation centers and other destinations are found. Improvements and installation of crosswalks are suggested in order to improve safety and walkability of child pedestrians in these areas.

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