Assessing Urban Green Space Impact on Air Quality in Metropolitan Community A

Thesis Abstract

Urban air pollution poses a significant health and environmental challenge in Metropolitan Community A, where rapid urbanization and increasing vehicular emissions have exacerbated air quality degradation. Amidst growing concerns about sustainable urban development, the potential mitigating effects of urban green spaces on air pollutants such as particulate matter (PM10 and PM2.5), nitrogen dioxide (NO2), and ozone (O3) warrant comprehensive investigation. This study aims to assess the impact of urban green spaces on air quality within Metropolitan Community A by examining spatial variability and identifying key green infrastructure features contributing to pollution reduction. The specific objectives include quantifying the relationship between green space characteristics and pollutant concentrations, identifying socioeconomic and land-use factors influencing green space distribution, and evaluating residents’ perceptions of green space efficacy in improving air quality. Employing a mixed-methods research design, the study integrates quantitative environmental data collection with qualitative insights to provide a comprehensive analysis. Quantitatively, the study area encompasses twenty strategically selected neighborhoods, with a total population of approximately 500,000 residents. A stratified random sampling technique was employed to select 150 households across diverse socioeconomic backgrounds. Environmental data were collected over a six-month period using portable air quality sensors positioned at multiple monitoring sites within green and non-green urban settings. The sensors measured concentrations of PM10, PM2.5, NO2, and O3 at hourly intervals. Additionally, geographic information system (GIS) spatial analysis was employed to map green space distribution, land use patterns, and pollutant dispersion. The qualitative component involved semi-structured interviews with 30 urban planners, environmental officials, and community leaders to explore policy perceptions and residents’ experiences regarding green space benefits and challenges. Data from sensors were subjected to descriptive statistical analysis, and relationships among variables were examined using multiple linear regression models. GIS spatial analysis facilitated the visualization of pollutant patterns relative to green space coverage, while thematic analysis was used to interpret interview transcripts. Expected findings suggest that neighborhoods with higher proportions of well-maintained green spaces exhibit significantly lower levels of PM10, PM2.5, and NO2, consistent with the theoretical framework grounded in the Ecosystem services theory and the Urban Heat Island (UHI) mitigation model. The study anticipates confirming that green space attributes, such as vegetation density and spatial connectivity, are key determinants of air quality improvements, with a notable influence of socioeconomic factors on green space accessibility. Furthermore, residents' perceptions are expected to align with empirical evidence, emphasizing the importance of strategic urban planning to maximize green infrastructure benefits. This research contributes novel empirical evidence to the discourse on urban environmental sustainability, offering a nuanced understanding of how green space characteristics influence air pollution mitigation in a rapidly urbanizing context. It advances theoretical knowledge by integrating ecosystem service frameworks with spatial analytical techniques in the specific setting of Metropolitan Community A, thereby filling existing gaps in empirical research on urban greening and air quality in developing cities. The main conclusion underscores the critical role of strategic urban planning in expanding and maintaining green spaces as a cost-effective measure to improve air quality. The study recommends policymakers prioritize green infrastructure development, incorporate green space considerations into land use planning, and promote community engagement to enhance green space accessibility and maintenance. Future research should explore longitudinal impacts of green space interventions and investigate additional health outcome correlations to strengthen evidence-based urban environmental policies.