Population Density, Inequality, and Exposure: The Spatial and Cultural Reconfiguration of Environmental Health in Large Cities

This study aims to analyze the impact of population density on urban health within the framework of environmental exposure and spatial inequalities. The research integrates population density data with air quality indicators—particularly PM2.5 and PM10 measurements—per capita green space availability, waste generation statistics, and tap water quality reports. The findings indicate that dense urban development reduces access to green spaces, while increased traffic, heating, and energy consumption exacerbate air pollution. Infrastructure pressure generates additional risks in waste management and water quality. PM2.5 levels are strongly associated with cardiovascular and respiratory diseases, and neighborhood-level disparities in waste accumulation and water quality are more pronounced in low-income areas. These results highlight that urban health cannot be reduced solely to service delivery; instead, it requires data-driven, risk-based, and equity-focused environmental health planning grounded in population density and socio-economic vulnerability. Cities in the 21st century, with rising population densities, are at the intersection of demographic, environmental, and health-related transformations. Population density directly affects the spatial distribution of environmental risks, including air quality, water security, waste management, and urban heat island effects. As density increases, infrastructure capacity is strained, environmental exposures become spatially concentrated, and vulnerable populations face elevated risks. In Turkey, highly populated cities such as Istanbul, Ankara, and Izmir demonstrate that standard, uniform environmental health services are insufficient. This study discusses how environmental health services in high-density cities should be tailored, considering spatial risk patterns and policy tools.