Environmental performance among manufacturers varies greatly and reflects political, institutional, economic, and social differences across the states. Information disclosure programs such as those administered by the U.S. Environmental Protection Agency are intended to spur manufacturers to comply with recommended pollution reduction levels. The objective of this study is to provide a better understanding of the variables that affect reductions in toxic chemical releases and human health risks. Changes in pollution amounts and exposure risk levels between 1991 and 1995 in state facilities across the nation are analyzed. The findings suggest that variation among the states in terms of ideology, environmental group membership, and policy liberalism drives environmental policy. Companies may reduce pollution voluntarily in anticipation of reactions by regulators and environmental groups and to avoid potential sanctions.