269 
tion thereof, and a registered participant in 
the Clean Cities Program of the Department 
of Energy; and 
(ii) include— 
(I) a description of the project 
proposed in the application, including 
how the project meets the requirements 
of this part; 
(II) an estimate of the ridership 
or degree of use of the project; 
(III) an estimate of the air pollu-
tion emissions reduced and fossil fuel 
displaced as a result of the project, and 
a plan to collect and disseminate envi-
ronmental data, related to the project 
to be funded under the grant, over the 
life of the project; 
(IV) a description of how the 
project will be sustainable without Fed-
eral assistance after the completion of 
the term of the grant; 
(V) a complete description of the 
costs of the project, including acquisi-
tion, 
construction, 
operation, 
and
270 
maintenance costs over the expected life 
of the project; 
(VI) a description of which costs 
of the project will be supported by Fed-
eral assistance under this part; and 
(VII) documentation to the satis-
faction of the Secretary that diesel fuel 
containing sulfur at not more than 15 
parts per million is available for car-
rying out the project, and a commit-
ment by the applicant to use such fuel 
in carrying out the project. 
(2) PARTNERS.—An applicant under paragraph 
(1) may carry out a project under the pilot program 
in partnership with public and private entities. 
(d) SELECTION CRITERIA.—In evaluating applica-
tions under the pilot program, the Secretary shall— 
(1) consider each applicant’s previous experience 
with similar projects; and 
(2) give priority consideration to applications 
that— 
(A) are most likely to maximize protection 
of the environment; 
(B) demonstrate the greatest commitment 
on the part of the applicant to ensure funding
271 
for the proposed project and the greatest likeli-
hood that the project will be maintained or ex-
panded after Federal assistance under this part 
is completed; and 
(C) exceed the minimum requirements of 
subsection (c)(1)(B)(ii). 
(e) PILOT PROJECT REQUIREMENTS.— 
(1) MAXIMUM AMOUNT.—The Secretary shall not 
provide more than $20,000,000 in Federal assistance 
under the pilot program to any applicant. 
(2) COST
SHARING.—The Secretary shall not 
provide more than 50 percent of the cost, incurred 
during the period of the grant, of any project under 
the pilot program. 
(3) MAXIMUM
PERIOD
OF
GRANTS.—The Sec-
retary shall not fund any applicant under the pilot 
program for more than 5 years. 
(4) DEPLOYMENT AND DISTRIBUTION.—The Sec-
retary shall seek to the maximum extent practicable 
to ensure a broad geographic distribution of project 
sites. 
(5) TRANSFER
OF
INFORMATION
AND
KNOWL-
EDGE.—The Secretary shall establish mechanisms to 
ensure that the information and knowledge gained by 
participants in the pilot program are transferred
272 
among the pilot program participants and to other 
interested parties, including other applicants that 
submitted applications. 
(f) SCHEDULE.— 
(1) PUBLICATION.—Not later than 90 days after 
the date of enactment of this Act, the Secretary shall 
publish in the Federal Register, Commerce Business 
Daily, and elsewhere as appropriate, a request for ap-
plications to undertake projects under the pilot pro-
gram. Applications shall be due not later than 180 
days after the date of publication of the notice. 
(2) SELECTION.—Not later than 180 days after 
the date by which applications for grants are due, the 
Secretary shall select by competitive, peer reviewed 
proposal, all applications for projects to be awarded 
a grant under the pilot program. 
(g) LIMIT ON FUNDING.—The Secretary shall provide 
not less than 20 nor more than 25 percent of the grant fund-
ing made available under this section for the acquisition 
of ultra-low sulfur diesel vehicles. 
§ 723. Reports to Congress 
(a) INITIAL REPORT.—Not later than 60 days after the 
date on which grants are awarded under this part, the Sec-
retary shall submit to Congress a report containing—
273 
(1) an identification of the grant recipients and 
a description of the projects to be funded; 
(2) an identification of other applicants that 
submitted applications for the pilot program; and 
(3) a description of the mechanisms used by the 
Secretary to ensure that the information and knowl-
edge gained by participants in the pilot program are 
transferred among the pilot program participants 
and to other interested parties, including other appli-
cants that submitted applications. 
(b) EVALUATION.—Not later than 3 years after the 
date of enactment of this Act, and annually thereafter until 
the pilot program ends, the Secretary shall submit to Con-
gress a report containing an evaluation of the effectiveness 
of the pilot program, including— 
(1) an assessment of the benefits to the environ-
ment derived from the projects included in the pilot 
program; and 
(2) an estimate of the potential benefits to the 
environment to be derived from widespread applica-
tion of alternative fueled vehicles and ultra-low sulfur 
diesel vehicles.
274 
§ 724. Authorization of appropriations 
There are authorized to be appropriated to the Sec-
retary to carry out this part $200,000,000, to remain avail-
able until expended. 
PART 3—FUEL CELL BUSES 
§ 731. Fuel cell transit bus demonstration 
(a) IN GENERAL.—The Secretary of Energy, in con-
sultation with the Secretary of Transportation, shall estab-
lish a transit bus demonstration program to make competi-
tive, merit-based awards for 5-year projects to demonstrate 
not more than 25 fuel cell transit buses (and necessary in-
frastructure) in 5 geographically dispersed localities. 
(b) PREFERENCE.—In selecting projects under this sec-
tion, the Secretary of Energy shall give preference to 
projects that are most likely to mitigate congestion and im-
prove air quality. 
(c) AUTHORIZATION OF APPROPRIATIONS.—There are 
authorized to be appropriated to the Secretary of Energy 
to carry out this section $10,000,000 for each of fiscal years 
2006 through 2010. 
Subtitle C—Clean School Buses 
§ 741. Definitions 
In this subtitle: 
(1) 
ADMINISTRATOR.—The 
term 
‘‘Adminis-
trator’’ means the Administrator of the Environ-
mental Protection Agency.
275 
(2) ALTERNATIVE FUEL.—The term ‘‘alternative 
fuel’’ means liquefied natural gas, compressed natural 
gas, liquefied petroleum gas, hydrogen, propane, or 
methanol or ethanol at no less than 85 percent by vol-
ume. 
(3) ALTERNATIVE FUEL SCHOOL BUS.—The term 
‘‘alternative fuel school bus’’ means a school bus that 
meets all of the requirements of this subtitle and is 
operated solely on an alternative fuel. 
(4) 
EMISSIONS
CONTROL
RETROFIT
TECH-
NOLOGY.—The term ‘‘emissions control retrofit tech-
nology’’ means a particulate filter or other emissions 
control equipment that is verified or certified by the 
Administrator or the California Air Resources Board 
as an effective emission reduction technology when in-
stalled on an existing school bus. 
(5) IDLING.—The term ‘‘idling’’ means operating 
an engine while remaining stationary for more than 
approximately 15 minutes, except that the term does 
not apply to routine stoppages associated with traffic 
movement or congestion. 
(6) SECRETARY.—The term ‘‘Secretary’’ means 
the Secretary of Energy. 
(7) ULTRA-LOW
SULFUR
DIESEL
FUEL.—The 
term ‘‘ultra-low sulfur diesel fuel’’ means diesel fuel
276 
that contains sulfur at not more than 15 parts per 
million. 
(8) ULTRA-LOW SULFUR DIESEL FUEL SCHOOL 
BUS.—The term ‘‘ultra-low sulfur diesel fuel school 
bus’’ means a school bus that meets all of the require-
ments of this subtitle and is operated solely on ultra- 
low sulfur diesel fuel. 
§ 742. Program for replacement of certain school 
buses with clean school buses 
(a) ESTABLISHMENT.—The Administrator, in con-
sultation with the Secretary and other appropriate Federal 
departments and agencies, shall establish a program for 
awarding grants on a competitive basis to eligible entities 
for the replacement of existing school buses manufactured 
before model year 1991 with alternative fuel school buses 
and ultra-low sulfur diesel fuel school buses. 
(b) REQUIREMENTS.— 
(1) IN GENERAL.—Not later than 90 days after 
the date of enactment of this Act, the Administrator 
shall establish and publish in the Federal Register 
grant requirements on eligibility for assistance, and 
on implementation of the program established under 
subsection (a), including instructions for the submis-
sion of grant applications and certification require-
ments to ensure compliance with this subtitle.
277 
(2) APPLICATION DEADLINES.—The requirements 
established under paragraph (1) shall require submis-
sion of grant applications not later than— 
(A) in the case of the first year of program 
implementation, the date that is 180 days after 
the publication of the requirements in the Fed-
eral Register; and 
(B) in the case of each subsequent year, 
June 1 of the year. 
(c) ELIGIBLE RECIPIENTS.—A grant shall be awarded 
under this section only— 
(1) to 1 or more local or State governmental en-
tities responsible for providing school bus service to 1 
or more public school systems or responsible for the 
purchase of school buses; 
(2) to 1 or more contracting entities that provide 
school bus service to 1 or more public school systems, 
if the grant application is submitted jointly with the 
1 or more school systems to be served by the buses, ex-
cept that the application may provide that buses pur-
chased using funds awarded shall be owned, operated, 
and maintained exclusively by the 1 or more con-
tracting entities; or 
(3) to a nonprofit school transportation associa-
tion representing private contracting entities, if the
278 
association has notified and received approval from 
the 1 or more school systems to be served by the buses. 
(d) AWARD DEADLINES.— 
(1) IN GENERAL.—Subject to paragraph (2), the 
Administrator shall award a grant made to a quali-
fied applicant for a fiscal year— 
(A) in the case of the first fiscal year of pro-
gram implementation, not later than the date 
that is 90 days after the application deadline es-
tablished under subsection (b)(2); and 
(B) in the case of each subsequent fiscal 
year, not later than August 1 of the fiscal year. 
(2) INSUFFICIENT NUMBER OF QUALIFIED GRANT 
APPLICATIONS.—If the Administrator does not receive 
a sufficient number of qualified grant applications to 
meet the requirements of subsection (i)(1) for a fiscal 
year, the Administrator shall award a grant made to 
a qualified applicant under subsection (i)(2) not later 
than September 30 of the fiscal year. 
(e) TYPES OF GRANTS.— 
(1) IN GENERAL.—A grant under this section 
shall be used for the replacement of school buses man-
ufactured before model year 1991 with alternative fuel 
school buses and ultra-low sulfur diesel fuel school 
buses.
279 
(2) NO ECONOMIC BENEFIT.—Other than the re-
ceipt of the grant, a recipient of a grant under this 
section may not receive any economic benefit in con-
nection with the receipt of the grant. 
(3) PRIORITY
OF
GRANT
APPLICATIONS.—The 
Administrator shall give priority to applicants that 
propose to replace school buses manufactured before 
model year 1977. 
(f) CONDITIONS OF GRANT.—A grant provided under 
this section shall include the following conditions: 
(1) SCHOOL
BUS
FLEET.—All buses acquired 
with funds provided under the grant shall be operated 
as part of the school bus fleet for which the grant was 
made for a minimum of 5 years. 
(2) USE OF FUNDS.—Funds provided under the 
grant may only be used— 
(A) to pay the cost, except as provided in 
paragraph (3), of new alternative fuel school 
buses or ultra-low sulfur diesel fuel school buses, 
including State taxes and contract fees associ-
ated with the acquisition of such buses; and 
(B) to provide— 
(i) up to 20 percent of the price of the 
alternative fuel school buses acquired, for 
necessary alternative fuel infrastructure if
280 
the infrastructure will only be available to 
the grant recipient; and 
(ii) up to 25 percent of the price of the 
alternative fuel school buses acquired, for 
necessary alternative fuel infrastructure if 
the infrastructure will be available to the 
grant recipient and to other bus fleets. 
(3) GRANT
RECIPIENT
FUNDS.—The grant re-
cipient shall be required to provide at least— 
(A) in the case of a grant recipient de-
scribed in paragraph (1) or (3) of subsection (c), 
the lesser of— 
(i) an amount equal to 15 percent of 
the total cost of each bus received; or 
(ii) $15,000 per bus; and 
(B) in the case of a grant recipient de-
scribed in subsection (c)(2), the lesser of— 
(i) an amount equal to 20 percent of 
the total cost of each bus received; or 
(ii) $20,000 per bus. 
(4) ULTRA-LOW SULFUR DIESEL FUEL.—In the 
case of a grant recipient receiving a grant for ultra- 
low sulfur diesel fuel school buses, the grant recipient 
shall be required to provide documentation to the sat-
isfaction of the Administrator that diesel fuel con-
281 
taining sulfur at not more than 15 parts per million 
is available for carrying out the purposes of the 
grant, and a commitment by the applicant to use 
such fuel in carrying out the purposes of the grant. 
(5) TIMING.—All alternative fuel school buses, 
ultra-low sulfur diesel fuel school buses, or alternative 
fuel infrastructure acquired under a grant awarded 
under this section shall be purchased and placed in 
service as soon as practicable. 
(g) BUSES.— 
(1) IN GENERAL.—Except as provided in para-
graph (2), funding under a grant made under this 
section for the acquisition of new alternative fuel 
school buses or ultra-low sulfur diesel fuel school buses 
shall only be used to acquire school buses— 
(A) with a gross vehicle weight of greater 
than 14,000 pounds; 
(B) that are powered by a heavy duty en-
gine; 
(C) in the case of alternative fuel school 
buses manufactured in model years 2004 through 
2006, that emit not more than 1.8 grams per 
brake horsepower-hour of nonmethane hydro-
carbons and oxides of nitrogen and .01 grams
282 
per brake horsepower-hour of particulate matter; 
and 
(D) in the case of ultra-low sulfur diesel 
fuel school buses manufactured in model years 
2004 through 2006, that emit not more than 2.5 
grams per brake horsepower-hour of nonmethane 
hydrocarbons and oxides of nitrogen and .01 
grams per brake horsepower-hour of particulate 
matter. 
(2) LIMITATIONS.—A bus shall not be acquired 
under this section that emits nonmethane hydro-
carbons, oxides of nitrogen, or particulate matter at 
a rate greater than the best performing technology of 
the same class of ultra-low sulfur diesel fuel school 
buses commercially available at the time the grant is 
made. 
(h) DEPLOYMENT AND DISTRIBUTION.—The Adminis-
trator shall— 
(1) seek, to the maximum extent practicable, to 
achieve nationwide deployment of alternative fuel 
school buses and ultra-low sulfur diesel fuel school 
buses through the program under this section; and 
(2) ensure a broad geographic distribution of 
grant awards, with a goal of no State receiving more
283 
than 10 percent of the grant funding made available 
under this section for a fiscal year. 
(i) ALLOCATION OF FUNDS.— 
(1) IN GENERAL.—Subject to paragraph (2), of 
the amount of grant funding made available to carry 
out this section for any fiscal year, the Administrator 
shall use— 
(A) 70 percent for the acquisition of alter-
native fuel school buses or supporting infrastruc-
ture; and 
(B) 30 percent for the acquisition of ultra- 
low sulfur diesel fuel school buses. 
(2) INSUFFICIENT NUMBER OF QUALIFIED GRANT 
APPLICATIONS.—After the first fiscal year in which 
this program is in effect, if the Administrator does 
not receive a sufficient number of qualified grant ap-
plications to meet the requirements of subparagraph 
(A) or (B) of paragraph (1) for a fiscal year, effective 
beginning on August 1 of the fiscal year, the Admin-
istrator shall make the remaining funds available to 
other qualified grant applicants under this section. 
(j) REDUCTION OF SCHOOL BUS IDLING.—Each local 
educational agency (as defined in section 9101 of the Ele-
mentary and Secondary Education Act of 1965 (20 U.S.C. 
7801)) that receives Federal funds under the Elementary
284 
and Secondary Education Act of 1965 (20 U.S.C. 6301 et 
seq.) is encouraged to develop a policy, consistent with the 
health, safety, and welfare of students and the proper oper-
ation and maintenance of school buses, to reduce the inci-
dence of unnecessary school bus idling at schools when pick-
ing up and unloading students. 
(k) ANNUAL REPORT.— 
(1) IN GENERAL.—Not later than January 31 of 
each year, the Administrator shall transmit to Con-
gress a report evaluating implementation of the pro-
grams under this section and section 743. 
(2) COMPONENTS.—The reports shall include a 
description of— 
(A) the total number of grant applications 
received; 
(B) the number and types of alternative fuel 
school buses, ultra-low sulfur diesel fuel school 
buses, and retrofitted buses requested in grant 
applications; 
(C) grants awarded and the criteria used to 
select the grant recipients; 
(D) certified engine emission levels of all 
buses purchased or retrofitted under the pro-
grams under this section and section 743;
285 
(E) an evaluation of the in-use emission 
level of buses purchased or retrofitted under the 
programs under this section and section 743; 
and 
(F) any other information the Adminis-
trator considers appropriate. 
(l) AUTHORIZATION OF APPROPRIATIONS.—There are 
authorized to be appropriated to the Administrator to carry 
out this section, to remain available until expended— 
(1) $45,000,000 for fiscal year 2005; 
(2) $65,000,000 for fiscal year 2006; 
(3) $90,000,000 for fiscal year 2007; and 
(4) such sums as are necessary for each of fiscal 
years 2008 and 2009. 
§ 743. Diesel retrofit program 
(a) ESTABLISHMENT.—The Administrator, in con-
sultation with the Secretary, shall establish a program for 
awarding grants on a competitive basis to entities for the 
installation of retrofit technologies for diesel school buses. 
(b) ELIGIBLE RECIPIENTS.—A grant shall be awarded 
under this section only— 
(1) to a local or State governmental entity re-
sponsible for providing school bus service to 1 or more 
public school systems;
286 
(2) to 1 or more contracting entities that provide 
school bus service to 1 or more public school systems, 
if the grant application is submitted jointly with the 
1 or more school systems that the buses will serve, ex-
cept that the application may provide that buses pur-
chased using funds awarded shall be owned, operated, 
and maintained exclusively by the 1 or more con-
tracting entities; or 
(3) to a nonprofit school transportation associa-
tion representing private contracting entities, if the 
association has notified and received approval from 
the 1 or more school systems to be served by the buses. 
(c) AWARDS.— 
(1) IN GENERAL.—The Administrator shall seek, 
to the maximum extent practicable, to ensure a broad 
geographic distribution of grants under this section. 
(2) 
PREFERENCES.—In 
making 
awards 
of 
grants under this section, the Administrator shall give 
preference to proposals that— 
(A) will achieve the greatest reductions in 
emissions of nonmethane hydrocarbons, oxides of 
nitrogen, or particulate matter per proposal or 
per bus; or
287 
(B) involve the use of emissions control ret-
rofit technology on diesel school buses that oper-
ate solely on ultra-low sulfur diesel fuel. 
(d) CONDITIONS OF GRANT.—A grant shall be pro-
vided under this section on the conditions that— 
(1) buses on which retrofit emissions-control 
technology are to be demonstrated— 
(A) will operate on ultra-low sulfur diesel 
fuel where such fuel is reasonably available or re-
quired for sale by State or local law or regula-
tion; 
(B) were manufactured in model year 1991 
or later; and 
(C) will be used for the transportation of 
school children to and from school for a min-
imum of 5 years; 
(2) grant funds will be used for the purchase of 
emission control retrofit technology, including State 
taxes and contract fees; and 
(3) grant recipients will provide at least 15 per-
cent of the total cost of the retrofit, including the pur-
chase of emission control retrofit technology and all 
necessary labor for installation of the retrofit.
288 
(e) VERIFICATION.—Not later than 90 days after the 
date of enactment of this Act, the Administrator shall pub-
lish in the Federal Register procedures to verify— 
(1) the retrofit emissions-control technology to be 
demonstrated; 
(2) that buses powered by ultra-low sulfur diesel 
fuel on which retrofit emissions-control technology are 
to be demonstrated will operate on diesel fuel con-
taining not more than 15 parts per million of sulfur; 
and 
(3) that grants are administered in accordance 
with this section. 
(f) AUTHORIZATION OF APPROPRIATIONS.—There are 
authorized to be appropriated to the Administrator to carry 
out this section, to remain available until expended— 
(1) $20,000,000 for fiscal year 2005; 
(2) $35,000,000 for fiscal year 2006; 
(3) $45,000,000 for fiscal year 2007; and 
(4) such sums as are necessary for each of fiscal 
years 2008 and 2009. 
§ 744. Fuel cell school buses 
(a) ESTABLISHMENT.—The Secretary shall establish a 
program for entering into cooperative agreements— 
(1) with private sector fuel cell bus developers for 
the development of fuel cell-powered school buses; and
289 
(2) subsequently, with not less than 2 units of 
local government using natural gas-powered school 
buses and such private sector fuel cell bus developers 
to demonstrate the use of fuel cell-powered school 
buses. 
(b) COST SHARING.—The non-Federal contribution for 
activities funded under this section shall be not less than— 
(1) 20 percent for fuel infrastructure develop-
ment activities; and 
(2) 50 percent for demonstration activities and 
for development activities not described in paragraph 
(1). 
(c) REPORTS TO CONGRESS.—Not later than 3 years 
after the date of enactment of this Act, the Secretary shall 
transmit to Congress a report that— 
(1) evaluates the process of converting natural 
gas infrastructure to accommodate fuel cell-powered 
school buses; and 
(2) assesses the results of the development and 
demonstration program under this section. 
(d) AUTHORIZATION OF APPROPRIATIONS.—There are 
authorized to be appropriated to the Secretary to carry out 
this section $25,000,000 for the period of fiscal years 2005 
through 2007.
290 
Subtitle D—Miscellaneous 
§ 751. Railroad efficiency 
(a) ESTABLISHMENT.—The Secretary of Energy shall, 
in cooperation with the Secretary of Transportation and 
the Administrator of the Environmental Protection Agency, 
establish a cost-shared, public-private research partnership 
involving the Federal Government, railroad carriers, loco-
motive manufacturers and equipment suppliers, and the As-
sociation of American Railroads, to develop and dem-
onstrate railroad locomotive technologies that increase fuel 
economy, reduce emissions, and lower costs of operation. 
(b) AUTHORIZATION OF APPROPRIATIONS.—There are 
authorized to be appropriated to the Secretary of Energy 
to carry out this section— 
(1) $25,000,000 for fiscal year 2006; 
(2) $35,000,000 for fiscal year 2007; and 
(3) $50,000,000 for fiscal year 2008. 
§ 752. Mobile emission reductions trading and cred-
iting 
(a) IN GENERAL.—Not later than 180 days after the 
date of enactment of this Act, the Administrator of the En-
vironmental Protection Agency shall submit to Congress a 
report on the experience of the Administrator with the trad-
ing of mobile source emission reduction credits for use by 
owners and operators of stationary source emission sources
291 
to meet emission offset requirements within a nonattain-
ment area. 
(b) CONTENTS.—The report shall describe— 
(1) projects approved by the Administrator that 
include the trading of mobile source emission reduc-
tion credits for use by stationary sources in com-
plying with offset requirements, including a descrip-
tion of— 
(A) project and stationary sources location; 
(B) volumes of emissions offset and traded; 
(C) the sources of mobile emission reduction 
credits; and 
(D) if available, the cost of the credits; 
(2) the significant issues identified by the Ad-
ministrator in consideration and approval of trading 
in the projects; 
(3) the requirements for monitoring and assess-
ing the air quality benefits of any approved project; 
(4) the statutory authority on which the Admin-
istrator has based approval of the projects; 
(5) an evaluation of how the resolution of issues 
in approved projects could be used in other projects; 
and 
(6) any other issues that the Administrator con-
siders relevant to the trading and generation of mo-
292 
bile source emission reduction credits for use by sta-
tionary sources or for other purposes. 
§ 753. Aviation fuel conservation and emissions 
(a) IN GENERAL.—Not later than 60 days after the 
date of enactment of this Act, the Administrator of the Fed-
eral Aviation Administration and the Administrator of the 
Environmental Protection Agency shall jointly initiate a 
study to identify— 
(1) the impact of aircraft emissions on air qual-
ity in nonattainment areas; and 
(2) ways to promote fuel conservation measures 
for aviation to— 
(A) enhance fuel efficiency; and 
(B) reduce emissions. 
(b) FOCUS.—The study under subsection (a) shall focus 
on how air traffic management inefficiencies, such as air-
craft idling at airports, result in unnecessary fuel burn and 
air emissions. 
(c) REPORT.—Not later than 1 year after the date of 
the initiation of the study under subsection (a), the Admin-
istrator of the Federal Aviation Administration and the Ad-
ministrator of the Environmental Protection Agency shall 
jointly submit to the Committee on Energy and Commerce 
and the Committee on Transportation and Infrastructure 
of the House of Representatives and the Committee on Envi-
293 
ronment and Public Works and the Committee on Com-
merce, Science, and Transportation of the Senate a report 
that— 
(1) describes the results of the study; and 
(2) includes any recommendations on ways in 
which unnecessary fuel use and emissions affecting 
air quality may be reduced— 
(A) without adversely affecting safety and 
security and increasing individual aircraft 
noise; and 
(B) while taking into account all aircraft 
emissions and the impact of the emissions on 
human health. 
§ 754. Diesel fueled vehicles 
(a) DEFINITION OF TIER 2 EMISSION STANDARDS.— 
In this section, the term ‘‘tier 2 emission standards’’ means 
the motor vehicle emission standards that apply to pas-
senger cars, light trucks, and larger passenger vehicles man-
ufactured after the 2003 model year, as issued on February 
10, 2000, by the Administrator of the Environmental Pro-
tection Agency under sections 202 and 211 of the Clean Air 
Act (42 U.S.C. 7521, 7545). 
(b) DIESEL COMBUSTION
AND AFTER-TREATMENT 
TECHNOLOGIES.—The Secretary of Energy shall accelerate