This project aims to investigate the connection between racial and ethnic disparities in asthma rates and urban planning policies that lead to uneven exposure to air pollution sources. By characterizing air pollution sources into its components, estimating their concentrations, and analyzing their associations with sociodemographic factors, the study seeks to identify the specific sources contributing to childhood asthma disparities among different racial and ethnic groups. Additionally, the project explores how zoning and gentrification impact the distribution of air pollution sources in Travis County. This research is critical as it could provide valuable evidence linking urban planning decisions to inequities in air pollution exposure and offer insights for more effective air pollution regulation and equitable urban planning to reduce health disparities related to lung diseases, particularly asthma, among minoritized populations.