The ultimate goal of the MII is to establish total facility emissions over extended periods; monthly or annual estimates are common. All analysis above considers the simplied case where (nearly) contemporaneous TD estimates were compared to an OEI estimate made for the facility. This comparison was typically limited to emissions measured in a single operating state, even when a operating state changed during the day (3 facilities), full estimates in each state were not possible. Emissions in operating states that were not active during measurements were not characterized by TD estimates nor measured by onsite methods.