More than four decades after it was enacted, the Clean Air Act remains one of the most significant and sweeping pieces of environmental legislation in the country's history. This established resource provides a broad and balanced perspective of the statute and the EPA's implementing regulations and policy guidance. Combining the experience and knowledge of 31 private and public sector Clean Air Act practitioners, this deskbook covers the entire statute as well as recent developments such as greenhouse gas emissions and response to Massachusetts v. EPA.