United States Air and Radiation EPA420-F-03-023
Environmental Protection June 2003
Agency
Office of Transportation and Air Quality
Draft
is the
The draft nonroad model calculates past, present, and future emission
inventories (i.e., tons of pollutant) for all nonroad equipment categories
except commercial marine, locomotives, and aircraft. Fuel types included
in the model are: gasoline, diesel, compressed natural gas, and liquefied
petroleum. The model estimates exhaust and evaporative hydrocarbons
(HC), carbon monoxide (CO), oxides of nitrogen (NOx), particulate
matter (PM), sulfur oxides (SOx), carbon dioxide (CO2). The user may
select a specific geographic area (i.e., national, state, or county) and time
period (i.e., annual, monthly, seasonal, or daily) for analysis.
What are the the
of to and the
draft
The emission inventories produced by the two versions are the same if
the scenario inputs are the same, but NONROAD2002a has a few en-
hancements:
" National Inventory Format (NIF) 2.0 output option for the National
Emissions Inventory (NEI) from the Reporting Utility
" Update of Florida Bade County (Federal Information Processing
Standards (FIPS) Code 26025) to Miami-Bade County (FIPS
26086)
9 More "what-if" analysis ability for fuel sulfur-to-sulfate conversion
rate (this is not expected to be used by state and local air agencies)
i Printed on Recycled Paper
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How is the for
NONROAD2002a?
The review period for draft NONROAD2002a will last until August 20,
2003, which is the same as the review period for the proposed Nonroad
Diesel Rule.
will the final NONROAD be
A final NONROAD model will be released in 2004, after the final Non-
road Diesel Engine Rule has been published.
What are the major in
the
and the June version?
Some of the most important changes affect compression-ignition (CI)
engines where the associated NOx and PM inventories are reduced by
about 35 to 50 percent, depending on year and pollutant. The new SOx
inventories are also less than the prior version — about 75 percent less for
compression-ignition (CI) engines and 65 percent less for spark-ignition
(SI) engines. More details of the inventory changes can be found in the
workshop presentations from November 5, 2002, which are available on
the nonroad modeling web page at: www.epa.gov/otaq/nonrdmdl.htm.
the all of
final to
date?
No. The model does not fully reflect the new recreational equipment and
large SI engine standards that were published in the Federal Register in
September 2002 (67 FR 68243). These will be added at a later date.
How do I for from the
and ignition
standards?
Until these benefits are incorporated into the NONROAD model, users
will need to estimate the exhaust, diurnal, hot soak, running loss, and
permeation emissions and benefits based on the information in the Sep-
tember 2002 Regulatory Support Document for this rule (EPA-420-R-
022). This document can be downloaded from the EPA Office of Trans-
portation and Air Quality web site at: www.epa.gov/otaq/recveh.htm.
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the
Tier 4 and fuel
standards?
No. These standards will be incorporated into the final version of NON-
ROAD when the rule becomes final.
What is on the of the
for official
EPA is allowing the use of the draft NONROAD2002a Model and associ-
ated default inputs in development of inventories supporting State Imple-
mentation Plans (SIPs). Although NONROAD2002a or its default inputs
may change between the public release of the draft and the final version,
now anticipated for 2004, the draft NONROAD2002a Model currently
represents EPA's best tool for estimating nonroad emissions, as evidenced
by the Agency's use in the Nonroad Diesel Engine Notice of Proposed
Rulemaking (NPRM). Therefore we are allowing state agencies to use
the draft model in SIPs during the period between public release of the
draft and final versions of the model.
EPA will not require that inventories developed using the draft version be
updated following release of the final version. However, since this
release does not include the benefits of the September 2002 final rule for
recreational vehicle, large SI, and diesel recreational marine engines, and
it also doesn't include the benefits that will be associated with the final
nonroad diesel rule, states may choose to update SIPs after EPA releases
the final version of NONROAD.
After the release of the final version of NONROAD, states that are just
beginning new SIP development, or are in the early stages of SIP devel-
opment, should use the final version of NONROAD for those new SIPs.
the for of the
be for
No. Option files created with previous versions of the model are not
compatible with NONROAD2002a.
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How can I if I
Please send an email with your question to nonroad@epa.gov or write
to:
U.S. Environmental Protection Agency
Assessment and Standards Division
Air Quality and Modeling Center
2000 Traverwood Drive
Ann Arbor, MI 48105
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