The book studies the relationship between economic agglomeration and environmental pollution from a spatial perspective through theoretical analyses and empirical discussions. At both microscopic and macroscopic levels, the author first explores the impact mechanism of the agglomeration of economic activities on environmental pollution and proposes research frameworks based on spatial economic theory and output density theory. Drawing on descriptive statistics and explorative spatial data from 283 cities in China, the book investigates the current development, spatial characteristics, influence path, and environmental efficiency of urban economic agglomeration and pollution in the People's Republic. The following empirical sections study spatial spillover effects, simultaneous bias and spatial interaction between agglomeration and pollution. The research findings give insight into interregional economic development, joint pollution control across regions, and the coordination of the two, especially in the context of developing countries. The title will appeal to researchers, students, government officials and policymakers interested in development economics, regional economics, urban economics, and environmental economics.