text: In this analysis , we used two of these well-established models , the Regional Modeling System for Aerosols and Deposition ( REMSAD ) and the Comprehensive Air Quality Model with Extensions ( CAMx ) , to develop a picture of future changes in air quality resulting from the implementation of the Clear Skies Act .
  
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  We used the Air and Train Systemic Model ( ATSM ) to create the entirety of this picture .