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2017 NEI Plan: Final Addendum

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EPA-454/R-19-011A
April 2019
2017 NEI Plan: Final Addendum
U.S. Environmental Protection Agency
Office of Air Quality Planning and Standards
Air Quality Assessment Division
Research Triangle Park, NC

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4/10/2019
2017 NEI Plan: Final Addendum
Since the release of the revised 2017 NEI Plan in July 2018, there have been several minor changes to the code
tables, and as a result of the shutdown, some minor changes to the overall 2017 NEI schedule and more
substantial changes to the nonpoint data category component of the NEI schedule. This document will list out
these changes, with references to sections in the 2017 NEI Plan where these changes take place. The revised
2017 NEI Plan document itself is not updated to reflect these changes.
This document is intended to assist State/Local/Tribe (SLT) data submitters for the 2017 NEI and refers to the
Emissions Inventory System (EIS) and the NEI and NOMAD SharePoint sites for access to much of the
information presented here. If you are an inventory developer and have questions about EIS and/or SharePoint
access, please contact Rich Mason.
This document also describes some issues discovered in the past several months relating to the NEI process.
2017 NEI Schedule Changes
No changes are expected to the plans for the Onroad Mobile, Nonroad Mobile and Event data category
inventories for the 2017 NEI. However, there is a one-month delay of the overall NEI release, and numerous
schedule modifications and refinements needed for the Nonpoint inventory.
Change to overall NEI Schedule
The 2017 NEI public release, including a functioning NEI data page with query tools, summaries and a Technical
Support Document, will be available on April 30, 2020. This is a one-month delay from the March 31, 2020 public
release reflected in Table 2-1 of the 2017 NEI Plan.
Refinements to the Point Inventory Development Schedule
The point inventory emissions and facility windows were closed for SLT agency submittal on February 1, 2019.
We are working on a case-by-case basis with SLTs that failed to submit a complete 2017 Point inventory for the
2017 NEI. Table 1 lays out post-April 2019 milestones for EPA and SLTs for the 2017 Point inventory; for
milestones already achieved, refer to Table 2-1 in the revised 2017 NEI Plan.
Table 1: Refined 2017 Point inventory development schedule
2017 NEI Point Inventory Milestone
New Date
Old Date
Notes
SLT corrections based on EPA feedback due
6/1/2019
5/15/2019
Completeness and outliers checked
Draft release EIS date-stamped inventory, for
internal review, (e.g., 2017draft_03jun2019...")
6/3/2019
6/1/2019

EIS date-stamped inventory, for SLT review, (e.g.,
2017draft_01jul2019...")
7/1/2019
7/1/2019
Will not include updated offshore
oil platform data
Final 2017 Point Inventory in EIS
4/1/2020
N/A

A draft release of the 2017 Point inventory in EIS will be available to SLT data submitters on approximately July
1, 2019 as a point inventory selection with a date stamp. This EIS selection will be constructed in a similar way as
a final NEI point inventory is typically built. It will include SLT submittals, with Toxics Release Inventory (TRI) and
2017 Continuous Emissions Modeling (CEM) data blended in for Electric Generating Units (EGUs). In addition, we
will process EIS HAP Augmentation on the SLT data to allow for complete HAP coverage of expected pollutants
not submitted by SLTs or TRI. PM component gap-fills and PM species (e.g., Black Carbon, Organic Carbon) are
also likely to be included. This draft version may not include some internal EPA-based data to fill in potential
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"holes" in mercury or other HAPs of interest; these components will be in later versions of the point inventory.
This selection will also be our first real-world test of the EIS selection rules - see: New Selection Rules Specifics.
EPA will then rerun the Point selection one last time and release the final 2017 Point inventory in EIS by April 1,
2020.
Significant revisions to the Nonpoint schedule
Table 2 lists several EPA and SLT milestones for the 2017 Nonpoint inventory; this level of detail was not
provided in the 2017 NEI Plan but we think SLTs will find this very useful as it informs how EPA and SLTs will
work to create the final 2017 Nonpoint inventory. The "Old Date" refers to either the date in the 2017 NEI Plan,
or an original estimate via a relevant NOMAD committee or mass NEI email update. We use the term "Bin" here
rather than "Category" (Cat) used in the 2017 NEI Plan. More information on the Nonpoint Inventory
development process and the EPA Wagon Wheel training are available on the Air Emissions Inventory Training
site.
Table 2: Refined 2017 Nonpoint inventory development schedule
2017 NEI (mostly Nonpoint) Milestone
Who
New Date
Old Date
Notes




Uses an agreed-to combination of SLT and




EPA 2017 livestock population data and




2014 Emission Factors from CMU model and




literature-based Emission Factors for sheep,




turkeys, goats and horses. Also includes




estimates for Alaska based on literature-
EPA posts draft livestock waste



based EFs for all animal types (CMU model
estimates
EPA
2/22/2019
N/A
does not include AK).
EPA provides draft Oil and Gas tools to




SLTs
EPA
4/5/2019
2/14/2019
This item was not in the 2017 NEI plan
EPA posts Bin 3 draft tools and input



Does not include Oil and Gas Tools (which
templates
EPA
4/30/2019
2/28/2019
will have been already provided)
EPA releases updated Wagon Wheel



We plan to load and release activity data
with latest activity data (all tools) on



and finalize input templates by 3/31/2019
the NOMAD SharePoint site
EPA
4/30/2019
3/31/2019
for most, if not all, Bin 1 and 2a tools.
SLT comments on draft 2017 livestock




waste estimates due
SLT
4/30/2019
N/A
This is a 2+ month review period for SLTs
SLT comments on oil and gas tool due
SLT
5/1/2019
N/A
4 weeks for SLT review




4 weeks to digest SLT comments, update
EPA finalizes and posts Oil and Gas tools
EPA
5/31/2019
N/A
and finalize tools
SLT comments on non-Oil and Gas Bin 3



4 weeks for SLT review, reduced from 8
tools due
SLT
5/31/2019
4/30/2019
weeks in 2017 NEI Plan




SLTs will have 30 days to review these




estimates. This review is not expected to




result in major changes or rerunning of
EPA posts fertilizer and livestock waste



either model, but rather, an opportunity to
emissions on SharePoint with 2017



check for other errors that can easily be
inputs
EPA
6/15/2019
N/A
addressed before finalization.
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2017 NEI (mostly Nonpoint) Milestone
Who
New Date
Old Date
Notes
SLT due date for Nonpoint: Survey, all
inputs, SLT (non-CMV/rail) emissions
SLT
6/30/2019
3/31/2019
A 3-month extension for all emissions
submittals and Bin 1, 2a and 2b inputs, but
only a 1-month extension for Bin 3 inputs
SLT comments on livestock waste and
fertilizer estimates (with 2017 inputs)
due
SLT
7/15/2019
N/A

EPA publishes Final Wagon Wheel tool
for all Bins/source categories in WW
EPA
7/31/2019
6/30/2019
Will reflect SLT inputs submitted by
6/30/2019
EPA posts 2017 estimates in EIS for all
nonpoint sources: Wagon Wheel and
non-Wagon Wheel sources
EPA
7/31/2019
12/31/2018
to
8/31/2019
Old Wagon Wheel dates were: 12/31/2018
(Bin 1 & Bin 2a), 2/28/2019 (Bin 2b),
8/31/2019 (Bin 3)
EPA feedback to SLTs on their
submitted inputs and emissions
EPA
7/1/2019 to
10/1/2019
5/1/2019 to
9/1/2019
EPA has 3 months to do this vs 4 months in
2017 Plan
SLT provides corrections on case-by-
case basis
SLT
7/15/2019
to 1/1/2020
5/15/2019
to
11/30/2019
Submittal window opened on case-by-case
basis
Release draft NP selection in EIS
EPA
11/1/2019
9/30/2019

2017 Nonpoint release in EIS
EPA
4/1/2020
2/28/2020
Final EPA and SLT QA, likely restricted to
Bin-3 inputs QA; NEI Technical Support
Document development.
Full 2017 NEI Public Release
EPA
4/30/2020
3/31/2020
Additional time is needed for EIS data to go
to web applications and final TSD
Overall Nonpoint Milestones
Except for commercial marine vessels and rail emission submittals that were due January 15, 2019, all nonpoint
emissions and/or SLT inputs are now due on June 30, 2019. The Nonpoint Survey deadline is also extended from
March 31, 2019 to June 30, 2019. This is a 1-month extension for the Bin 3 input submittals and a 3-month
extension for the Nonpoint Survey and all non-Bin 3 tool inputs and emissions. The EIS submittal window for the
Nonpoint data category will close on June 30, 2019.
All SLT inputs should be downloaded from the NOMAD folder "Blank Templates for SLTs to Download and Edit",
renamed, edited by SLTs and then uploaded to the NOMAD folder "	ripleted Templates—Please name
with your postal code as first two letters of file" by June 30, 2019, preferably sooner for Bin 1, 2a and 2b tools.
The draft version of all Wagon Wheel tools (Category/Bins 1, 2a, 2b and 3), NEMO documentation, and
associated input templates will be posted to the NOMAD SharePoint site on April 30, 2019. The SLT comment
period on the Bin 1, Bin 2a, and Bin 2b tools has passed, so no new methodology changes are permitted for
these tools. These draft tools will also reflect the latest activity data available as of late-March 2019, and for Bin
1, Bin 2a and Bin 2b tools, this activity data update will be the only difference compared to the tools currently on
SharePoint. Note, if you want the draft version of the EPA tools, set to be released April 30th, to reflect your
input data, then you should submit your input templates to the NOMAD SharePoint site by early April.
Reasonable-value and properly-formatted inputs submitted earlier are most likely to make it into these draft
tools.
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Comments on the Bin 3 Wagon Wheel tools are due by May 31, and EPA will finalize these Bin 3 tools with any
SLT-submitted inputs by July 31, 2019. EPA will provide feedback to SLTs on their submitted inputs and
emissions between July and September 2019. EPA will accept SLT-submitted corrections, on a case-by-case basis
through January 1, 2020. A draft version of the Nonpoint 2017 NEI will be available in EIS by November 1, 2019,
and a final version in EIS by April 1, 2020.
Sector-specific milestone details are provided below.
Livestock Waste
EPA posted draft livestock waste estimates for the 2017 NEI on the NOMAD SharePoint site on February 22,
2019. These draft estimates use EPA-based and SLT-reviewed year-2017 animal population data and 2014
emission factors from the Carnegie Mellon University (CMU) model for most animals and literature-based
emission factors for sheep and turkeys. SLTs will have over two months to provide EPA comments on these draft
estimates - due April 30, 2019. EPA will then post revised 2017 livestock waste estimates, reflecting year-2017
emission factors and SLT comments received prior ot April 30, on June 15, 2019. SLTs comments on these
estimates are then due to EPA by July 15, 2019, and EPA will post the final livestock waste emissions in EIS by
July 31, 2019.
Agricultural Fertilizer Application
The Draft 2017 emissions and activity data used to develop these estimates were posted for review on the
NOMAD SharePoint site under the 2017 NOMAD > Ag Fertilizer folder. The due date for comments on both has
passed.
A new Community Multiscale Air Quality (CMAQ) model run with actual 2017 inputs -and any activity data
already-submitted by SLTs- will be posted on SharePoint by June 15, 2019. SLTs comments on these estimates
are then due to EPA by July 15, 2019, and EPA will post the final agricultural fertilizer application emissions in EIS
by July 31, 2019.
Oil and Gas
A draft version of the EPA Oil and Gas Production and Exploration tools will be posted on SharePoint by April 5,
2019. SLT comments on the draft version of the tool are due by May 1, 2019 and EPA will finalize and post the
tool on SharePoint by May 31, 2019.
Residential Wood Combustion (RWC)
EPA estimates will more closely follow the "Bin 3" schedule than the faster Bin 2b schedule because the multi-
state survey used to gather updated appliance profiles and burn rates is still being analyzed. EPA will share
analysis on the new RWC survey, with comparisons to other survey data and the 2014 NEI estimates in April
2019. EPA will collaborate with SLTs to determine an overall approach for 2017 EPA estimates during the spring.
Biogenics
We will wait for 2017 meteorology before rerunning the BEIS model used to create the EPA biogenics estimates.
We expect to post EPA biogenic estimates in May 2019.
Agricultural Field Burning
Draft estimates were posted on SharePoint in October 2018. EPA has received additional activity data including
updated VOC and VOC-FIAP emission factors for sugarcane burning and will post final estimates by June 15,
2019. SLTs will have until July 15, 2019 to submit any comments on these estimates, which EPA will finalize in EIS
by July 31, 2019.
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Updated Point-Nonpoint SCC crosswalk
The Point-Nonpoint SCC crosswalk has been updated for year 2017 on SharePoint to reflect changes needed for
Bin 3 tools. Most of the proposed changes are limited to Solvents, with limited changes to the Oil and Gas and
ICI Fuel Combustion sectors.
Additional Clarification on Events (wildfires and prescribed burning)
We are basically following the 2017 Plan for Event fires. We have received numerous SLT-activity datasets and
we will work to incorporate those into the final NEI by the dates indicated in the 2017 NEI Plan. We will allow
SLTs to review those estimates; however, this review will be more for identification of small errors that can be
corrected easily, as will not have resources to re-run the models based on review comments. The NEI Plan also
outlines that we may include Lead (Pb) emissions from these fires. A review of Pb test data is ongoing and we
may include them for review in the final 2017 NEI, or, if the Pb emission factor test results cannot be
vetted/reviewed in time, we will wait until the 2020 NEI to include these estimates.
SCC code changes
Refer to the EIS or public Source Classification Codes web site for the most up-to-date list of active SCCs. The
following are some, but not all, key SCC changes made since the publication of the 2017 NEI Plan last summer:
Non point
•	New Oil and Gas sector SCCs: There are 7 new SCCs and 3 newly-retired SCCs. These updates will be
reflected in the draft version of the EPA Oil and Gas tool and new OG/OS assignments are being
developed
•	Un-retirement of general freestanding woodstoves SCC (2104008300). The EIS Option Group/Option Set
(OGOS) selection rule will prevent SLT-submitted estimates to this SCC from double-counting with EPA
and/or SLT-submitted estimates for more-specific types of freestanding wood stoves.
•	New and retired SCCs for Commercial Marine Vessels: The CMV SCCs for "port" and "underway" total
diesel and residual fuel have been retired and replaced with SCCs that reflect fuel, location (port vs
underway), vessel type (C1/C2 vs C3) and engine-based (mode vs auxiliary); these new SCCs conform
better to current inventory development methods.
Events
•	New SCCs for pile burns: 17 new SCCs for pile burning have been developed to reflect different or not
elsewhere classified crop types.
•	Prairie grass burning SCC moved from ag burning (nonpoint) to new Events data category (Prescribed
fire) SCC: In the 2014 NEI, SCC 2801500170 was used in the "Agricultural Burning" sector in the
Nonpoint data category to house all grass/pasture burning. Most of the activity in this SCC came from
the "Flint Hills" fires that occur yearly in KS and parts of OK. After discussing the situation with KS, we
will be moving these fires in the 2017 NEI to the Events data category, under the prescribed fire SCCs.
More specifically, for all the activity associated with just the "Flint Hills" fires (as identified by KS), we
will estimate the emissions and put them in a new SCC 2811021000 in the Events/Prescribed fire
category.
Nonroad Mobile
•	New and retired SCCs: Nonroad SCCs have been overhauled, aggregated to conform better with MOVES,
in a manner that is similar to what was done for onroad mobile in 2014 NEI.
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Important Specific Issues for Data Submitters
Pay attention to EIS feedback reports
Pollutant group and member submitted for same process: example, if you submit Cr3, Cr6 and total chromium,
then the entire process (all CAPs/HAPs) will be discarded and will show up in your feedback report as a critical
error (#2320) message "Process Emissions Data for a defined Group of Pollutants can contain either the
pollutant representing the group total value, or any number pollutants representing the group member values,
but not both."
For point sources: if the last inventory year on the process has a date before 2017, you will get a critical error
(#2319) message "Please review the Reporting Periods associated with the Emissions Process to ensure the
Inventory Year of the Reporting Period is not greater than the Emissions Process Last Inventory Year." on
submittal, and the entire process will be discarded. There are two solutions: go into EIS and manually delete the
last inventory year, or, set this value to a year beyond 2017 -if you know the precise date! Note: EIS currently
limits this date to year 2049 or earlier.
Submitting emissions to retired SCCs
If you submit emissions to a retired SCC, the entire process will be discarded and will show up in your feedback
report as a critical error (#90) message "Source Classification Code must match value in list of registered codes."
Refer to the "Map To" field in the SCC table to help chose an appropriate SCC for any retired SCC you submitted.
Nonpoint Survey Modified for new Oil and Gas SCCs
For the 11 SLTs that completed the Oil and Gas portion of the Nonpoint Survey prior to December 20, 2019,
their status was changed to "in progress" so you can review the NEW oil and gas SCCs.
The option to "not accept" EPA estimates in the Nonpoint Survey does not prevent EPA HAP and PM
augmentation from applying to the 2017 NEI selection. For example, if a SLT submits only PM2.5, EPA will
generate PM10. Another example: if an SLT submits only some VOC HAPs (or none), and EPA HAP Augmentation
has profiles that create additional VOC-HAPs, then SLT-based VOC will be used to create all expected VOC HAPs -
see the "Expected Pollutant List for Nonpoint SCCs" for the complete list of expected HAPs.
Pollutant Group Rules
The information here supplements Appendix 5 in the 2017 NEI Plan. Use the information here over any that
conflicts in Appendix 5; for example, the removal of within dataset pollutant rules for xylenes and cresols -
highlighted below.
Within Dataset Pollutant Rules
The following applies when S/L/T or EPA submits a dataset to EIS. EIS does not allow certain HAPs to be reported
at the same process together if they are in the same group and may overlap. For example, you cannot report an
individual PAH such as benzo(a)pyrene with "PAH, total" because "PAH, total" may include benzo(a)pyrene. EIS
will give you a critical error (#2320) message (see above) and none of the data you submitted for that process
will be loaded. The following is a list of the HAP and HAP groups that cannot be reported together:
1)	Any individual PAH with "PAH, total" (130498292)
2)	Any individual polychlorinated biphenyl with Polychlorinated biphenyls (1336363)
3)	Any individual HAP glycol ether with the group of HAP glycol ethers (171)
4)	Hexavalent and/or trivalent chromium with Chromium (7440473)
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5) Any of the 25 specific PAHs that are in pollutant code N590 or "PAH, total" with" Polycyclic aromatic
compounds (includes 25 specific compounds)" (N590) [this rule was added when we added pollutant
code N590, which is a TRI pollutant representing a specific group of 25 PAHs]
We recently removed the within dataset pollutant rules for xylenes and cresols such that we no longer assume
there is double counting of an individual isomer is reported with the group. Thus, you can report a specific
xylene isomer with Xylenes (Mixed Isomers) (1330207) and you can report a specific cresol isomer with
Cresol/Cresylic Acid (Mixed Isomers) (1319773). In any downstream summaries or processing the emissions
would be summed across all pollutants in the group. For example, total XYLENE would be the sum of all isomers
plus the Mixed Isomers.
Across Dataset Pollutant Rules
The following applies when a selection is performed in EIS (different datasets are combined using a pre-
determined hierarchy for selecting a single emission estimate per pollutant/process). Because different datasets
may represent overlapping pollutant emissions differently, we need to be sure we do not double count
emissions. For example, a state may report "PAH, total" whereas an EPA dataset may have individual PAHs. To
ensure we do not double count during a selection, we instituted EIS selection rules that exclude emissions from
overlapping pollutants across different datasets. The rules will result in the highest priority dataset in the
hierarchy being chosen no matter whether they report the more detailed pollutants or the broad group and the
lower priority datasets with overlapping pollutants to be excluded. For example, for Cresols and xylenes:
1)	If the higher priority dataset has the mixed isomers pollutant, then no individual isomers from any lower
priority dataset will be used.
2)	If the higher priority dataset has any individual isomers, then the mixed isomers pollutant from a lower
priority dataset will not be used.
Below is a list of overlapping pollutants that these rules address:
Pollutant Group
Overlaps
Cresols
Individual isomers (o-, m-, p-) with Cresol/Cresylic Acid (Mixed Isomers) (1319773)
Xylenes
Individual isomers (o-, m-, p-) with Xylenes (Mixed Isomers) (1330207)
Glycol Ethers
Individual compounds with glycol ethers group (171)
PCBs
Individual compounds with Polychlorinated biphenyls (1336363)
Chromium1
Hexavalent chromium with chromium trioxide or chromic acid
Nickel
Nickel with Nickel Subsulfide, Nickel Refinery Dust or Nickel Refinery Dust
PAHs2
Individual PAHs with "PAH, total" or "PAH/POM unspecified"2
PAH/POM unspecified with PAH, total
Members of Benzofluoranthenes group with Benzofluoranthenes
PAH, total or PAH/POM unspecified with" Polycyclic aromatic compounds (includes
25 specific compounds)" (PAC)
Individual compounds comprising PAC with PAC
1	-rules apply after chromium speciation is done in EIS
2	-PAH/POM unspecified does not overlap with individual PAHs within a dataset (it was added to allow agencies
to report a mix of known and unknown PAHs at the same process) but it can overlap individual PAHs across
datasets
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New Selection Rules Specifics
We will be using several EIS selection rules for the first time for the 2017 NEI Point and Nonpoint data
categories. These rules should greatly-limit the amount of "tagging" of SLT and EPA data that have been used for
past selections. There are three components of these rules for point and nonpoint selection:
Point
1)	Pollutant grouping (parents/children): Refer to the Section "Pollutant Group Rules" above.
2)	EPA EGU unit-level rules: EPA develops estimates for a suite of pollutants for many Electric Generating
Units (EGUs) based upon throughput values reported to the Clean Air Markets Division's CEM database
and average emission factors. These emission estimates are used to gap-fill in the NEI selection where
S/L/Ts have not reported the pollutant. The EPA estimates are for the entire emission unit, but the
emissions must be reported at a process, similar to all other EIS emissions. EPA tries to load these unit-
level emissions at the existing EIS process (created by the responsible S/L/T agency) that accounts for
the bulk of the S/L/Ts emissions, if reported. But even for cases where the S/L/T may have reported
some emissions across several emission processes within the emission unit, this selection rule will
exclude from selection the EPA estimates for any pollutant where the S/L/T has reported that pollutant
at any process within the emission unit. This is the same logic and exclusion that has been followed in
earlier NEI years by means of "tagging out" the EPA EGU values.
3)	TRI site-level rules: EPA loads the Toxics Release Inventory emissions values to EIS facilities. These
values will be used to gap fill in the NEI selection where S/L/Ts have not reported that pollutant. EPA
loads these TRI facility-level reported values to one of two emission processes created by EPA at each
facility - one for stack releases and one for fugitive releases. This rule will exclude from selection any
TRI value for a pollutant that the S/L/T has reported at any one or more emission processes within that
facility. This is the same logic and exclusion that has been followed in earlier NEI years by means of
"tagging out" the TRI values.
Nonpoint
1)	Pollutant grouping (parents/children): Refer to the Section "Pollutant Group Rules" above.
2)	Option Group/Option Set (OGOS): There are no changes in the functionality of this EIS feature. Refer to
Appendix 6 in the 2017 NEI Plan for more information. EPA and SLT workgroups will likely modify, by
late-March 2019, the OGOS assignments for several SCCs in the Oil and Gas and Solvents sectors. Please
familiarize yourself with this document and associated training materials (beginning on slide 44).
Submitting emissions to potentially overlapping "general" and "specific" nonpoint SCCs will not be
prevented or show up in an EIS feedback report; however, both types of SCCs may not be selected in the
NEI depending on OGOS assignments.
3)	NonPoint Survey: No changes in function or details other than Oil and Gas SCCs. Refer to Section 5.4.6 in
the 2017 NEI Plan for more information.
Chromium speciation changes resulting from new NAICS assignments
Chromium speciation by NAICS code is most common for the Toxics Release Inventory (TRI) portion of the Point
Inventory. Per Section 3.2, NAICS codes changed in the 2017 NEI, and the speciation profiles (from total
chromium to hexavalent chromium in particular) are not the same between the old NAICS codes used in the
2014 NEI and the active, and in many cases new, NAICS codes in the 2017 TRI/NEI. This may result in new
elevated risk estimates, and Madeleine Strum is working on this analysis.
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United States	Office of Air Quality Planning and Standards	Publication No. EPA-454/R-19-011A
Environmental Protection	Air Quality Assessment Division	April 2019
Agency	Research Triangle Park, NC

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