Handbook 18: Addressing Air Quality Issues in the NEPA Process for Highway Projects

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The purpose of the handbook on Addressing Air Quality Issues in the NEPA Process for Highway Projects is to assist practitioners in addressing air quality issues, including transportation conformity requirements, as part of the National Environmental Policy Act (NEPA) process for highway projects. The handbook summarizes key requirements under NEPA and the Clean Air Act and provides advice for documenting compliance with the Clean Air Act requirements as a part of the NEPA process.