IMPROVEMENTS TO NONROAD MODEL INPUTS FOR MIDWESTERN

The purpose of this project was to develop data specific to Midwest region states to improve upon EPA’s default 2002 nonroad construction and agricultural engine emission estimates. In EPA’s NONROAD emissions model, state-level populations and activity for construction and agricultural categories are derived from national sources of data, and county-level activity is estimated using surrogate indicators that may not always correlate well with local equipment use. Information was collected via survey methods, and from publically available sources of data, to develop local model inputs for equipment populations, engine characteristics, and spatial and temporal activity. These revised inputs will be used to support future Lake Michigan Air Directors Consortium (LADCO) regional emissions modeling efforts