Aviation Emissions and Air Quality Handbook  100$_{ }$ $_{ }$  MOU  Memorandum of Understanding  MOVES  Motor Vehicle Emissions Simulator  MPO  Metropolitan Planning Organization  MT CO$_{2 }$ Metric tons of CO$_{2 }$ MT CO$_{2e }$ Metric tons of CO$_{2 }$equivalent  MWC  Municipal Waste Combustors  N$_{2}$O  Nitrous Oxide  NAAQS  National Ambient Air Quality Standards  NASA  National Aeronautics and Space Administration  NCDC  National Climatic Data Center  NEPA  National Environmental Policy Act  NIRS  Noise Integrated Routing System  NO  Nitric oxide  NO$_{2 }$ Nitrogen Dioxide  NOA  Notice of Availability  NOAA  National Oceanic and Atmospheric Administration  NOI  Notice of Intent  NO$_{x }$ Nitrogen Oxide  O$_{3 }$ Ozone  OFEE  Office of the Federal Environmental Executive  OTAQ  EPA Office of Transportation and Air Quality  OTR  Ozone Transport Region  PARTNER  Partnership for Air Transportation Noise & Emissions Reduction  Pb  Lead  PCA  Preconditioned air  PFCs  Perfluorocarbons  PM  Particulate Matter  PM$_{10 }$ Particulate matter with an aerodynamic diameter of 10 microns or less  PM$_{2.5 }$ Particulate matter with an aerodynamic diameter of 2.5 microns or less  RFP  Reasonable Further Progress Plans  ROD  Record of Decision  ROP  Rate of Progress  SF$_{6 }$ Sulfur hexafluoride 