Technical Support Document (TSD) for 

Emissions Inventories for the State Implementation Plan Revision: 

NOx Vehicle Emission Budget Revisions Based on MOVES 2010a 

Reading, PA Eight-Hour Ozone Maintenance Area 

Submitted by the Bureau of Air Quality 

Pennsylvania Department of Environmental Protection 

TSD Prepared January 2014 by 

Jessica L. Fry 

Office of Air Monitoring and Analysis, 3AP40 

U.S. Environmental Protection Agency, Region 3 

1650 Arch Street 

Philadelphia, Pennsylvania 19103 

Reviewed by Alice H. Chow, Associate Director 

Office of Air Monitoring and Analysis (3AP40) 
I. Introduction 

The purpose of this document is to provide a technical summary of the Office of Air 

Monitoring and Analysis (OAMA) review of the emissions inventories submitted with 

the State Implementation Plan (SIP) Revision: NOx Motor Vehicle Emission Budget 

Revisions Based on MOVES 201 Oa for the Reading Eight-Hour Ozone Maintenance Plan 

submitted by the Pennsylvania Department of Environmental Protection (P ADEP). The 

Reading Nonattainment Area consists of all ofBerks County, PA. Pennsylvania is 

updating their NOx motor vehicle emissions budgets submitted in thei'r Eight-hour Ozone 

SIP for the Reading Area for the years 2009 and 2018 using MOVES20 1 Oa and 

subsequently reviewing and updating (if needed) the NOx emissions inventories for point, 

nonpoint, nonroad, and onroad sources. Emission inventories in the Reading Area SIP 

revision are used to document that the SIP continues to meet applicable requirements 

when previous onroad mobile emissions inventories are replaced with MOVES20 1 Oa 

inventories. The plan should also demons.trate that growth and control strategy 

assumptions for point, nonpoint, and nonroad mobile sources continue to be valid. This 

review is to confirm that any minor updates have not changed the overall conclusions of 

the SIP. Any questions pertaining to this teclmical summary should be directed to Alice 

Chow, Associate Director, Office of Air Monitoring and Analysis, at 215-814-2144 or 

via email at chow.alice@epa.gov. 

II 2009 and 2018 Emissions Inventories 

In the Reading Area SIP revision, emissions inventories are used to support the 

States claim that the area is continuing to attain the 1997 8-hour ozone standard as set 

forth in the SIP when using MOVES 2010a for the onroad mobile emissions inventory. 

In order to do this, the state should review the point, nonpoint, and nonroad NOx 

emissions inventories submitted with the SIP for the interim (2009) and attainment 

(20 18) years and determine if changes in growth and control strategy assumptions affect 

the conclusion that the area will remain in compliance with the 1997 8-hour ozone 

standard. 

In the Reading Area SIP revision P ADEP analyzed the NOx point source 

emissions estimates for 2009 and 2018 submitted with the Eight-Hour Ozone NAAQS 

Reading Area SIP. PADEP has resubmitted point source emissions inventories for 2009 

and 2018. For the 2009 point source inventory, PADEP submitted actual 2009 emissions 

from individual facilities in the area. The emissions were submitted by tons/year and 

tons/day. For the 2018 projected inventories PADEP used information developed for the 

MARAMA 2011 regional modeling effort and did a straight-line interpolation between 

the 2007 MARAMA baseline inventory and the 2020 MARAMA projected year 

inventory. It was concluded that the emissions had been overestimated in the SIP and 

that the area will continue to be in attainment with the new emission estimates. OAMA 

staff reviewed the analysis and believes it is reasonable. 
Pennsylvania conducted an analysis ofthe NOx emissions estimates for nonpoint 

sources submitted for 2009 and 2018 with the 1997 ozone NAAQS Reading Area SIP to 

determine if the nonpoint NOx emissions inventory needed to be updated for this revision. 

For the 2009 nonpoint source emissions Pennsylvania compared U.S. Department of 

Commerce, Bureau of Census, and the Energy Information Administration, U.S. 

Department of Energy actual growth from 2002-2009 to the growth estimates used in the 

Reading Area SIP. Pennsylvania concluded that growth estimates for two nonpoint 

source areas, population growth and natural gas combustion had been under-estimated, 

while most other areas were over-estimated. To account for the differences in growth 

assumptions Pennsylvania updated their 2009 inventory by linearly interpolating the 2007 

MARAMA baseline inventory and the 2017 MARAMA projected year to derive 2009 

emissions. For the 2018 emission estimates PADEP revised their growth estimates with 

updated data used in the MARAMA 2011 and used the same linear interpolation method 

used for the point sources to update the 2018 inventory. OAMA staff reviewed the 

analysis and believes it is reasonable. 

The nonroad emissions inventory estimates for NOx submitted for 2009 and 2018 

in the Reading Area SIP were calculated using USEPA's NONROAD2005 Model. 

Pennsylvania compared growth estimates used in the NONROAD2005 to the growth 

estimates in the current NONROAD2008a. These comparisons along with fleet turnover 

led Pennsylvania to the conclusion that the general downward trend in NOx emissions in 

this sector supports the conclusion that the area will continue to maintain compliance 

with the eight-hour ozone standard and therefore no revisions were made. OAMA staff 

r(lviewed the analysis and believes it is reasonable. 

In the Reading Area SIP revision, onroad emissions were estimated using the 

MOVES2010a model by Michael Baker, Jr., Inc., who is a consultant to the Pennsylvania 

Department of Transportation (PennDOT). PADEP revised the 2004 and 2009 onroad 

NOx emissions inventories and the 2018 projection inventory for the Reading Area SIP 

revision. Pennsylvania used the same Statistical Evaluation of Projected Traffic method 

for forecasting traffic growth or vehicle miles travelled. New input files for use in 

MOVES 2010a were developed using the local data from PennDOT, with some inputs 

being developed by the software PPSUITE, which is a tool for estimating speeds and 

processing emissions rates based upon accepted transportation engineering 

methodologies. · Mobile emissions values were given in units of tons per summer day. 

OAMA staff reviewed the files and emission results and believes them to be reasonable. 
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