AbstractThis article is a comparative case study of environmental regulation in Canada and the United States, focussing on one important area of environmental regulation, pesticides, and on the treatment of North America's most commercially important pesticide, alachlor. Alachlor is a clear case of policy divergence: Canadians have banned the substance while the US has decided to keep it on the market with minimal restrictions. Three major explanations for the divergence are explored: science, interest group politics, and legal and institutional arrangements. The article concludes that while different interpretations of the risks posed by alachlor contributed to the different decisions, they can only be explained with reference to the economic importance of alachlor and the need to maintain the legitimacy of current institutional arrangements. The concluding section outlines a framework for explaining similarities and differences in environmental, health and safety regulations across nations.
