The study team utilized ONGAEIR inventory data from 2021 to build MAES simulations. The simulations were tuned to match the reported methane emissions reported in the inventory and the result stayed within 10% when we stopped tuning the model, as seen in Table (Step A in Figure ). Then, we added (large) emitters classified as fugitives from CM detections to all simulated sites in the DJ basin, classified under all prototypical sites. The simulation results are summarized and compared against emissions reported by 435 operators to ONGAEIR in operators take a critical step toward more accurate emissions reporting and effective mitigation efforts.