Figure shows the annual range of CH 4 emissions for this example site, when the simulation is conducted 425 for a longer time-frame (365 days) and 100 MC iterations. When abnormal conditions are not considered (as is commonly done in the reported inventories), the annual average CH 4 emissions amounts to 44.4 metric tons. Conversely, when abnormal emissions are included, the annual average CH 4 emissions rise to 57.8 metric tons, a 30.2% increase. Also shown as dotted horizontal lines are average across all MC emissions -blue the emissions excluding these abnormal events, red including abnormal events.