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# 2005 National Emissions Inventory Data & Documentation
Explanation of File Formats
General Inventory Information
EPA developed the 2005 NEI v2 ba sed on a reduced level of ef fort. Part of this reduced effort involved using some NEI 2002 v3 da ta in the NEI 2005 v2 as surrogates for emissions data representing 2005. Listed below is specific information on this issue for each data category in the 2005 NEI v2.

Point Sources

 Mixture of 2002 and 2005 emissions. 2005 emissions from the following data sources 2005 EGU emissions/heat input from EPA's Acid Rain Program HAP data received from States and industry to support the MACT program, including the recent Risk and Te chnology Review rulemaking 2005 State, local, and tribal data submitted to EPA under the CERR HAP data from Toxic Release Inventory (T RI) for missing facilities and pollutants Off-shore platform data from Mineral Management Services (MMS)

 The Start Date/End Date fields in the AL LNEIHAP and ALLNEICAP files document which data are 2005 emissions and which data are 2002 emissions.
Nonpoint Sources

 2002 emission estimates used for all nonpoint sourves except wildfires and prescribed burning

 2002 VOC emissions from fireploaces were revised based on a new emission factor.

Onroad Mobile Sources

 All emissions estimates based on 2005 vehicl e miles traveled (VMT) and a 2005 run of the National Mobile In ventory Model (NMIM)

Nonroad Mobile Sources

 All emission estimates based on 2005 run of the National Mobile Inventory Model (NMIM)

Prior to using the 2005 NEI for analyses, user s should consider whether the use of 2002 data as a surrogate for the selected source s documented above materially affects their analysis. For example, analyses that requir e actual 2005 data for every source in the inventory would be limited since some sect ors include 2002 emissions. Likewise, microlevel analyses focusing on specific sectors using a mixture of years would be similarly affected.

EPA evaluates inventories, as part of a “m odeling platform,” for use in regulation development or Regulatory Impact Analysis (RIA). The technique used is called model 

## Technology Transfer Network Clearinghouse for Inventories & Emissions Factors htt p : // www.e p a. g ov / ttn / chief / net / 2005inventor y .html Last u p dated on Tuesda y, Jul y 06

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6/28/2011 htt p ://www.e p a. g ov/ttn/chief/net/2005inventor y .htmlperformance evaluation. These evaluations ar e intended to demonstrate that an air quality modeling platform has sufficient predic tive capability by comparing the air quality modeling results to ambient data. The modeling platforms include not only the emission inventory data, but also the air quality model, meteorology simulations, initial conditions, boundary conditions, emissions processing assumptions for spatial and temporal allocation and other parameters needed for such simulations. These model performance evaluations are described in technical supp ort documents (TSDs) created by EPA in support of regulatory actions and are refere nced in preamble text and RIA documents. EPA use of the 2005 NEI v2 is limited to those cases where model performance is not adversely affected by the use of surrogate data based on pre-determined benchmarks.

Inventory Documentation

Point NEI Point 2005 Documentation Updated April 6, 2010 Chromium Speciation EIS Code Look up tables Updated October 6, 2008 NEI2005 Look up tables other than those in cluded in EIS Code Look up Tables Updated April 4, 2009 Mercury Speciation (ZIP 30K) Updated December 19, 2006. Profiles were updated for 2002 NEI source categories including new data for mobile sources. Toxicity weighting factors (MDB 290K) Updated January 10, 2007.

Mobile 2005 Mobile NEI Version 2 Report Commerical Marine Vessels 2002 and 2005 Overview of 2005 Version Mobile
Inventory Data

Tier Summaries Tiersummaries contain only criteria pollutant s. The 42 category summaries contains boty criteria and HAPS. Both the tier summaries and the 42 category summaries contains data from all data categories (point, nonpoint and mobile). Tier_Summaries 42 Category Summaries

Mobile Sector Data 2005 NEI Version 2 SCC Summaries - SCC and pollutant descripti ons are provided at EIS Code Tables NMIM County Database (NCD) for 2005 V2 If you have any questions, please contact Laurel Driver or(919) 541-2859

Biogenic Sector Data Biogenic Sector Data - Updated May 2010.

Point Sector Data Version 2 of the 2005 NEI - The following zippe d Access summary files were created in January 2009 and contain annual emissions in tons per year. If you have qny questions question, please contact Roy Huntley or (919) 541-1060.

Point Facility Summary - For both CAPs and HAPs SCC Summary - For both CAPs and HAPs at co unty, state and national level. NAICS Summary - For both CAPs and HAPs ALLNEI HAP Annual 01233008 - Point stack summary data for HAPs only ALLNEICAP Annual 113020078 - Point stack summary data for CAPs only 

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### Posted Updates to Data
November 20, 2008 Mobile 2005 v2 Summaries added NMIM Counter Database (NCD) for 2005 v2 added

December 11, 2008 2005 Mobile NEI Version 2 Report Lead Summaries - State facility and process level table for Stationary Sources of lead emissions
Nonpoint Sector Data Version 2 of the 2005NEI - The following zippe d Access summary files were created in January 2009 and contain annual emissions in to ns per year. Only wildfires, prescribed burn and residential wood were updated from the 2005 Version1. If you have any questions, please contact Roy Huntley or (919) 541-1060. SCC Summary - For Both CAPS and HAPS at county, state and national level.

National Emissions Inventory Input Format

NEI Code Tables 

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6/28/2011 htt p ://www.e p a. g ov/ttn/chief/net/2005inventor y .html