NEPA - National Environmental Policy Act of 1969. (Public Law 91 190.)
NIGHTTIME AVERAGE SOUND LEVEL (NL)- The average sound level during nighttime hours between 10:00 pm and 6:59 a.m. Sometimes symbolized Ln.
National Environmental Policy Act of 1969 (NEPA) - The original legislation establishing the environmental review process for proposed Federal actions.
Environmental Assessment (EA): A statement prepared under the requirements of the National Environmental Policy Act of 1969 (NEPA), Section 102(2) (c).
 See also: Flight path, Route, Antenna, Terminal radar service area, Air traffic
  
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