WEP/AOI products are available for 76 IMPROVE sites that represent the potential contribution of 2028 emissions for 116 Class I areas (CIAs) in the 13 WRAP contiguous and neighboring states in the western U.S. For each Class I area there are four directories containing the various analysis products:

1. EWRT = Extinction Weighted Residence Time
2. RANK_POINT = Rank Point
3. RT = Residence Time
4. WEP = Weighted Emissions Potential

For more information, please refer to the WEP/AOI Analysis Summary.