Emission Inventory Issues

1
Emission Inventory Issues

• Roy Huntley
• Emission Inventory Analysis Group, US EPA,
  OAQPS
• June 20, 2007
• Huntley.Roy_at_epa.gov

2
What the PM Rule Requires States to Do Regarding
Inventories

• Base Year Inventory
• Projection Year Inventory
• Reasonable Further Progress

3
Base Year Inventory

• Used for Attainment Demonstration
• 2002 is recommended for base year but could be
  other suitable year
• Emission requirements
• CERR Emission requirements are a minimum
• (Consolidated Emission Reporting Rule)
• http//www.epa.gov/ttn/chief/cerr/index.html

4
Base Year Inventory

• Report directly emitted PM plus all PM precursors
• Includes VOC, NOx, SO2, and NH3
• Plus CO
• Include PM condensables
• Required by CERR
• PM emissions limits in SIP dont have to include
  condensables, but PM in the EI has to include
  condensables.
• May want to more highly resolve emissions from
  certain nonpoint categories
• Like ports, residential wood combustion

5
Projection Year Inventory

• Inventory projected to year prior to attainment
• Ex. 2009 for 2010 attainment
• Reason is that attainment date is April 5
• May have multiple projection years
• Potentially 2009, 2012, 2014
• Same level of detail as base year inventory

6
Overview of Preparing a File for Attainment
Modeling
7
Preparing Emission Inventory Data File for
Modeling

• AQ models need hourly emissions of model species
• Temporally allocate emissions to hourly
• Spatially allocate emissions to grid cells
• Speciate PM VOC
• Do for base and future year(s)

8
Some Things to Consider

• Can use hourly EGU data from CAMD (EPA) for base
  year
• Can spatially allocate onroad emissions to a road
  network

9
Tools

• PM resource center Provides links to resources
  used for developing PM 2.5 emission inventories.
• http//www.epa.gov/ttn/chief/eiip/pm25inventory/in
  dex.html
• Getting Started
• Introduction to PM2.5 inventories, standards, and
  data.
• Inventory Preparation
• Inventory concepts, guidance and procedures.
• Tools
• Emission Estimation Tools and Activity Data.
• Emissions QC, Preprocessing and Projections
• Quality Control (QC) and model preprocessing
  resources.
• Emission Modeling Clearinghouse (later slide)

10
Tools (continued)

• Emission Factors
• Webfire - http//www.epa.gov/ttn/chief/efpac/index
  .html
• NEI documentation - http//www.epa.gov/ttn/chief/n
  et/2002inventory.htmldocumentation
• Nonpoint documentation, Appendix C Emission
  Factors and County-Level Activity Data Used to
  Calculate 2002 Emissions by Category
• SPECIATE
• SPECIATE is the EPA's repository of total organic
  compound (TOC) and particulate matter (PM)
  speciation profiles of air pollution sources.
• SPECIATE 4.0 replaces the prior version of the
  SPECIATE version 3.2 released November 2002. It
  includes a total of 4,080 PM and TOC profiles
  including 2,019 new profiles.
• http//www.epa.gov/ttn/chief/software/speciate/ind
  ex.html

11
Tools (continued)

• Mobile source models
• MOBILE6.2 (http//www.epa.gov/otaq/mobile.htm)
• Contact - mobile_at_epa.gov
• NONROAD2005 (http//www.epa.gov/otaq/nonrdmdl.htm)
  
• Contact - nonroad_at_epa.gov
• PM augmentation
• Creating PM10 data from PM data
• Creating PM2.5 data from PM10 data.
• Adding condensables
• http//www.epa.gov/ttn/chief/net/2002inventory.htm
  l

12
Tools (continued)

• Emission Modeling Clearinghouse
• http//www.epa.gov/ttn/chief/emch/invent/index.htm
  l
• EI conference proceedings
• http//www.epa.gov/ttn/chief/conferences.html
• EIA/DOE state level data on fuel consumption
  (distillate oil, kerosene, etc) by sector
  (industrial, commercial, etc)
• http//www.eia.doe.gov/emeu/states/_seds.html