Sec. 2: Regulatory Framework National Environmental Policy Act (NEPA) FAA Order 1050.1F  FAA Order 5050.4b  Environmental Impacts: Policies  and Procedures and Desk  Reference  National Environmental Policy Act  (NEPA) Implementing Instructions  for Airport Projects  8 Order 1050.1F  Order 5050.4b  [Hdbk. Pgs. 4 - 6] FAA Air Quality Handbook Tutorial  Federal Aviation  Administration 