Appendix B1 (Washington DC

- MD

- VA Redesignation Request & Maintenance Plan,

May 22, 20 13 ) Page 1



# Appendix B 1

Technical Support Document

for the Development of N onroad M obile ( Except M arine, A irport, and R ailroad)

E missions inventories for 2025

(Washington, D C

- MD

- VA PM2.5 Nonattainment Area)Appendix B1 (Washington DC

- MD

- VA Redesignation Request & Maintenance Plan,

May 22, 20 13 ) Page 2 

### Table of Contents

1.0 INTRODUCTION

............................................................ ..................................3

1.1 GEOGRAPHIC RESOLUTIO N

................................ ................................ ................................ ...... 3

1.2 POLLUTAN TS

................................ ................................ ................................ ................................ .. 4

1.3 DESCRIPTION OF NMIM MODEL VERSION USED F OR 2025 INVENTORY DEVELOPMENT

................................ ................................ ................................ .............................. 4

1.4 DEESCRIPTION OF NMIM MODEL INPUTS USED FO R 2025 INVENTORY DEVELOPMENT

................................ ................................ ................................ .............................. 4

1.5 EMISSIONS SUMMARY

................................ ................................ ................................ ................. 5Appendix B1 (Washington DC

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May 22, 20 13 ) Page 3 

### 1.0 INTRODUCTION

This technical support document (TSD) describes in detail the input data and their sources and the method used to develop projected emission s for nonroad mobile sources (except for marine vessels, airport, and railroad) for 2025 for PM2.5

- Pri, NOx, and SO2 for the Washington, DC

- MD

- VA PM2.5 nonattainment area counties and citie s

. Emissions for 2007
, 2017 , and 2025 (Virginia only) were estimated by MARAMA and the details of the development of these emissions are described in the MARAMA TSD s listed in Appendix A1.

Nonroad Mobile Sources include equipment s such as forklifts, law n and garden equipment s , portable generators, marine vessels, airplanes, locomotives, etc. Except for marine vessels, airplanes, and railroad locomotives (MAR), the inventory for all other nonroad mobile

sources was developed using the most current version of USEPA’s NONROAD model as embedded in the National Mobile Inventory Model (NMIM)

. Th e NONROAD model does not include emissions from MAR sources . E missions from these sources for 2025 were estimated by MARAMA and the details of the development of these emissions are described in the MARAMA TSD titled “ Technical Support Document for the Development of the 2025 Emission Inventory for PM Nonattainment Counties in the MANE

- VU Region Version 3.3 Rev.2

. January 23, 2 012 ” listed in Appendix A 1

.
1.1 GEOGRAPHIC RESOLUTION
The inventory was developed at the county /city level and emissions summaries by jurisdiction for all counties and cities in the Washignton, DC

- MD

- VA PM2.5 nonattainment area (1997 annual PM2.5 NAAQS) are pr o vided.

List of Washington, DC

- MD

- VA PM 2.5 Nonattainment Areas Counties & Cities

State FIPS Code County /City

DC 11001 Washington MD 24017 Charles MD 24021 Frederick MD 24031 Montgomery MD 24033 Prince George VA 51013 Arlington VA 51059 Fairfax VA 51107 Loudoun VA 51153 Prince William VA 51510 Alexandria VA 51600 Fairfax City VA 51610 Falls Church City VA 51683 Manassas City VA 51685 Manassas Park CityAppendix B1 (Washington DC

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May 22, 20 13 ) Page 4 1.2 POLLUTANTS
The inventory includes emissions for directly emitted PM2.5 (PM2.5

- Pri), oxides of nitrogen ( NO x ) , and sulfur dioxide ( SO 2 ).

1.3 DESCRIPTION OF NMIM M ODEL VERSION USED FOR 2025

INVENTORY DEVELOPMENT

M W COG used the same NMIM version as the one used by MARAM A for develop ing the 2017 and 2025 inventor ies . A description of the NMIM version is provided in the MARAMA TSD titled “Technical Support Document f or the Development of the 2017 / 2020 Emission Inventories for Regional Air Quality Modeling in the Northeas t / Mid

- Atlantic Region Version 3.3 , January 23, 2012 ”. MWCOG used the NMIM2008 software (version NMIM20090504), the revised NMIM County Database (NCD2009 0910 MARAMA ), and
N ONROAD2008a (July 2009 version). A detailed description of the NMIM model is available at the EPA web

- site ( http://www.epa.gov/otaq/nmim.htm )

.
1.4 DEESCRIPTION OF NMIM MODEL INPUTS USED FOR 2025

INVENTORY DEVELOPMENT
MARAMA developed the version 3.3 (most current version till completion of this PM2.5 maintenance plan) of the 2025 NMIM emission inventory for Virginia for PM2.5 maintenance plan purposes , but it did not do so for the District of Columbia and Maryland. However, MARAMA developed the version 3.3 of the NMIM inventory for the tw o jurisdictions for 2017 for the regional photochemical modeling purposes (See Appendix A for MARAMA TSD for the development of the 2017 NMIM analysis) . Therefore, MWCOG developed the 2025 NMIM analysis for the District of Columbia and Maryland u sing the i nputs used by
MARAMA for developing the above mentioned version 3.3 of the 2017 modeling inventory for th e two jurisdictions

. M ete o rology and allocation files used by MARAMA for the 2017 analysis for the above two jurisdictions were applied to the 2025 anl ysis as well

. Fuel charachteristcs used by MARAMA for the 2017 analysis for the two jurisdictions were NMIM defaults for 2017 and are the same as the NMIM defaults for 20 2 5. Therefore, the same fuel charachteristics w ere also used for the 2025 analysis.
MWCOG replicated the 2025 NMIM emissions for Virignia using MARAMA’s inputs. These inputs are described in detail in the MARAMA TSD for the development of 2025 emission inventories listed in Appendix A 1

.Appendix B1 (Washington DC

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May 22, 20 13 ) Page 5 1.5 EMISSIONS SUMMARY
2025 Nonroad Emissions (Excludi ng MAR Sources ) Summary by Jurisdiction

County/City NOx SO2 PM2.5

- Pri

Washington, DC 992.3 3.0 72.3

Charles 365.7 1.1 28.3

Frederick 502.4 1.8 72.0

Montgomery 1400.6 5.2 241.9

Prince George 1130.6 3.9 150.5

Arlington 413.6 1.2 35.1

Fairfax 1469.9 6.5 249.7

Loudoun 928.8 3.6 139.5

Prince William 623.5 2.3 84.4

Alexandria 80.3 0.4 14.6

Fairfax City 33.8 0.2 7.6

Falls Church City 18.3 0.1 4.8

Manassas City 30.9 0.2 3.6

Manassas Park City 17.9 0.1 4.6

State Total

Washington, DC 992.3 3.0 72.3

Maryland 3399.3 12.0 492.8

Virginia 3617.0 14.6 543.8

Region Total 8008.6 29.7 1108.9