Aviation Emissions and Air Quality Handbook  SIP  State Implementation Plan  SO$_{2 }$ Sulfur Dioxide  TDS  Total Dissolved Solids  TIM  Times-in-mode  TIP  Transportation Implementation Plan  TOG  Total Organic Gas  TRB  Transportation Research Board  μg/m 3  Micrograms per cubic meter  VALE  Voluntary Airport Low Emissions  VMT  Vehicle Miles Travelled  VOCs  Volatile Organic Compounds  101$_{ }$