Median Life, Annual Activity, and Load Factor Values for Nonroad Engine Emissions Modeling

EPA’s NONROAD model computes emission inventories for nonroad engines. This report documents the default input values of median life, annual activity, and load factor for various types of nonroad engines. These values are used to calculate the fleet age distributions for each engine type included in this model. Annual activity and load factor values are also used to calculate the yearly emissions for each engine type included in the model.