2008 EPA Datasets for NonPoint Sources

The EPA datasets for the Nonpoint Sources were developed in coordination with Eastern Regional Technical Advisory Committee (ERTAC) which is a group of state and local agency inventory staff. The coordination with the states and locals was instigated by ERTAC with the purpose of getting agreement on emission factors and methodologies to create emission estimates among the states and EPA for the 2008 NEI. This collaboration was accomplished through a series of technical teleconferences starting September of 2008 through April 2009. For more information, see the paper entitled "Implementing a Collaborative Process to Improve the Consistency, Transparency, and Accessibility of the Nonpoint Source Emission Estimates in the 2008 National Emissions Inventory" by Jonathan G. Dorn and Frank Divita, Jr. of E.H. Pechan & Associates, Roy Huntley of EPA, and Mark Janssen of Lake Michigan Air Directors Consortium.

EPA Data – files that contain the emission estimates developed by EPA under the ERTAC collaboration are listed here. The files contain MS Excel spreadsheets with emission factors and activities and county level allocation factors, and MS Word documents that describe the methodology used to estimate emissions. The emission sectors are divided into 2 groups. The first group are sectors that EPA expects to be all in nonpoint with no point source contribution. The second group are sectors that EPA expects some sources might be large enough to be reported in the point data category. EPA treated these two groups differently, as described later in this text. There were some issues idenified due to the overlapping SCC codes in some S/L/T/ data.