the issue of environmental justice arrived on the governmental agenda, using the framework suggested by John Kingdon ( 1995); Chapter 4 presents the model that guides our research in Chapters 5-7. Part 2 includes our empirical work that tests our hypotheses. Specifically, Chapters 5-7 analyze the relationships between race, class, political mobilization, and exposure to environmental hazards in U.S. states, counties, and cities when all other explanations are held constant. Chapter 8 recaps the conclusions from the empirical analyses contained in Chapters 5-7. Finally, Part 3 focuses on the development of a rational, equitable, and efficient policy to ameliorate environmental injustice. Specifically, Chapter 9 places the Chapter 8 conclusions against the backdrop of existing policies for mitigating environmental injustice in the United States. Then, Chapter 10 discusses several varieties of policies that might be designed to ameliorate environmental injustice and concludes with several specific recommendations for policymakers who are concerned with achieving environmental justice.