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APPENDIX A

REGULATORY AMENDMENTS
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PROPOSED REGULATION ORDER

Adopt the following new sections of Title 13, California Code of Regulations, to read as

set forth in the following pages:

Section 1956.1 Exhaust Emission Standards and Test Procedures

for 1985 and Subsequent Model Year Heavy-Duty

Urban Transit Bus Engines and Vehicles

Section 1956.2 Fleet Rule for Urban Transit Bus Operators

Section 1956.3 Zero Emission Bus Requirements

Section 1956.4 Reporting Requirements for Urban Transit Bus

Operators

Amend the following section of Title 13, California Code of Regulations, to read as set

forth in the following pages:

Section 1956.8 Exhaust Emission Standards and Test Procedures

for 1985 and Subsequent Model Year Heavy-Duty

Engines and Vehicles
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SECTION 1956.1, TITLE 13, CCR

Add to Title 13, California Code of Regulations, new section 1956.1, to read:

1956.1 Exhaust Emission Standards and Test Procedures - 1985 and Subsequent

Model Heavy Duty Urban Bus Engine and Vehicles

(a) The exhaust emissions from new 1985 and subsequent model heavy-duty

diesel cycle urban bus engines and vehicles fueled by methanol, natural

gas, liquefied petroleum gas, and petroleum shall not exceed the

following, by model year, in grams per brake horsepower-hour (g/bhp-hr):

(1) 1985-1986 - 1.3 total hydrocarbons [or Organic Material

Hydrocarbon Equivalent (OMHCE) for methanol-fueled buses],

15.5 carbon monoxide (CO), and 5.1 oxides of nitrogen (NOx).

(2) 1987- (a manufacturer may certify to the 1988 emission standards

one year early as an option) - 1.3 total hydrocarbons (or OMHCE

for methanol-fueled buses), 15.5 CO, and 5.1 NOx.

(3) 1988-1990 - 1.3 HC (or OMHCE for methanol-fueled buses),

15.5 CO, 6.0 NOx, 0.60 particulate matter (PM), and for 1990 only,

1.2 optional non-methane hydrocarbons (NMHC).

(4) 1991-1993 - 1.3 HC (or OMHCE for methanol-fueled buses),

1.2 optional NMHC, 15.5 CO, 5.0 NOx, and 0.10 PM. Emissions

from methanol-fueled, natural-gas-fueled and liquefied-petroleumgas-fueled urban bus engines may be included in the averaging

program for petroleum-fueled engines other than urban bus

engines.

(5) 1994-1995 - 1.3 HC (or OMHCE for methanol-fueled buses),

1.2 optional NMHC, 15.5 CO, 5.0 NOx (or optional 3.5 to 0.5 NOx),

and 0.07 PM. Emissions from methanol-fueled, natural-gas-fueled

and liquefied-petroleum-gas-fueled urban bus engines, may be

included in the averaging program for petroleum-fueled engines

other than urban bus engines.

 (6) 1996-2003 - 1.3 HC or OMHCE, 1.2 optional NMHC, 15.5 CO,

4.0 NOx, and 0.05 PM (0.07 PM in-use).

(A) For 1996 and 1997 only, a manufacturer may apply to the

Executive Officer for an exemption from the 4.0 NOx

standard, not to exceed 10% of the average of the

manufacturer’s total urban bus sales in California for the
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three preceding model years, upon providing technical

justification and sales data for each exemption applied for.

(B) 1998 through 2003 model year engines may generate

averaging, banking, and trading credits in accordance with

the requirements for averaging, banking and trading

programs set forth in “California Exhaust Emission

Standards and Test Procedures for 1985 and Subsequent

Model Heavy Duty Diesel Engines and Vehicles” in

subdivision (b) of section 1956.8, 13 CCR.

(C) Manufacturers may choose to certify 1998 through

September 30, 2002 model year bus engines to an optional

NOx emissions standard between 0.5 and 2.5 g/bhp-hr. A

manufacturer may certify to any standard between the

values of 2.5 and 0.5g/bhp-hr, by 0.5 g/bhp-hr increments.

Manufacturers may not use engines certified to this optional

NOx standard for any averaging, banking, or trading

program set forth in the test procedures document

incorporated in subdivision (b) of section 1956.8, 13 CCR.

(7) October 2002-2006 optional standards -- Manufacturers may

choose to certify to an optional 1.8 to 0.3 g/bhp-hr NOx plus NMHC

standard, measured as the arithmetic sum of the NOx and NMHC

exhaust component certification values, without restriction on

individual component certification values; provided that engines

certified to this optional reduced-emission NOx standard may not

participate in any averaging, banking, or trading program set forth

in the test procedures document incorporated in subdivision (b) of

section 1956.8, 13 CCR. A manufacturer may certify to any

standard between the values of 1.8 to 0.3 g/bhp-hr, by 0.3 g/bhp-hr

NOx + NMHC increments. Manufacturers certifying to this optional

standard must also certify to a PM standard of 0.03, 0.02, or 0.01

g/bhp-hr.

(8) 2004 – 2006: Except as provided in (9), below, the required

standard shall be 2.4 NMHC plus NOx measured as the arithmetic

sum of exhaust component certification values for these pollutants,

without restriction on individual component values, 15.5 CO, and

0.05 PM (0.07 PM in-use).

(A) Manufacturers may choose to certify to a 2.5 optional

combined NOx + NMHC standard, provided that the NMHC

exhaust component certification value shall not exceed 0.5

g/bhp-hr.
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(B) Emissions averaging may be used to meet the combined

NOx + NMHC standard, the optional combined NOx +

NMHC standard set forth in paragraph (A), and the PM

standard.

(C) The combined NOx + NMHC standard and the optional

combined NOx + NMHC standard described in paragraph

(A) may serve as the certification standard for the higher

emitting fueling mode of an engine certified under the dual

fueling mode certification process set forth in section

1956.8(a)(3), 13 CCR.

(9) 2004-2006 – For diesel or dual-fuel urban bus engines, the

standards are 0.5 NOx, 0.01 PM, 0.05 NMHC, 5.0 CO, and 0.01

formaldehyde. As an option, manufacturers may choose to meet

these standards with an engine that is certified to the standards in

(8) above, equipped with an aftertreatment system that reduces

NOx to 0.5 and PM to 0.01 standards. Manufacturers shall be

responsible for full certification, durability, testing, and warranty and

other requirements for the base engine. For the aftertreatment

system, manufacturers shall not be subject to the certification

durability requirements, or in-use recall and enforcement

provisions, but are subject to warranty provisions for functionality.

(10) 2007 and subsequent – 0.2 NOx, 0.01 PM, 0.05 NMHC, 5.0 CO,

and 0.01 formaldehyde. Engines certified to this standard shall

meet the given standards for each pollutant, and must not

participate in any averaging, banking, and trading program as

described in subdivision (b) of section 1956.8, 13 CCR.

NOTE: Authority cited: Sections 39600, 39601, 43013, 43018, 43100, 43101, 43104,

and 43806 Health and Safety Code and section 28114 Vehicle Code

Reference: Sections 39002, 39003, 39017, 39033, 39500, 39650, 39657, 39667,

39701, 40000, 43000, 43000.5, 43009, 43013, 43018, 43102, 43806, Health and Safety

Code, and sections 27157 and 28114 Vehicle Code.
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SECTION 1956.2, TITLE 13, CCR

Add to Title 13, California Code of Regulations, new section 1956.2, to read:

1956.2 Fleet Rule for Urban Transit Bus Operators

(a) To encourage transit agencies that operate urban bus fleets to purchase

or lease currently available lower emission alternative-fuel buses, while

also providing flexibility to such fleet operators to determine their optimal

fleet mix in consideration of such factors as air quality benefits, service

availability, cost, efficiency, safety, and convenience, two paths to

compliance with this fleet rule are available: the alternative-fuel path and

the diesel path. Transit agencies must choose their compliance path, and

those choosing the alternative-fuel path shall notify ARB of their intent to

follow that path, by January 31, 2001. Reporting requirements for that

notification are set forth in subdivision (a)(1) of section 1956.4, 13 CCR.

(b) Transit agencies on the alternative-fuel path shall meet the following

requirements:

(1) Upon approval of the regulation, and through Model Year 2015, 85

percent of all urban buses purchased or leased each year must be

alternative-fuel buses.

(2) NOx fleet average requirements as set forth in subsection (d),

below.

(3) Beginning October 1, 2002, engines certified to an optional PM

standard of 0.03 g/bhp-hr or lower shall be used.

(4) PM retrofit requirements and use of low sulfur fuel as set forth in

subsection (e), below.

(5) Zero emission bus purchase requirements beginning in model year

2010, in accordance with the requirements in section 1956.3, 13,

CCR.

(6) Reporting requirements as set forth in section 1956.4, 13 CCR.

(c) Transit agencies on the diesel path shall meet the following requirements:

(1) NOx fleet average requirements as set forth in subsection (d),

below.

(2) PM retrofit requirements and use of low sulfur fuel as set forth in

subsection (e), below.

(3) Zero emission bus demonstration in 2003-2004, as required in

section 1956.3.

(4) Beginning January 1, 2004, transit agencies on the diesel path shall

not take delivery of any buses certified to emissions levels in

excess of those specified in subdivision (a)(9) of section 1956.1, 13

CCR.
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(5) Zero emission bus purchase requirements beginning in model year

2008, in accordance with the requirements in section 1956.3, 13

CCR.

(6) Reporting requirements as set forth in section 1956.4, 13 CCR.

(d) Beginning October 1, 2002, no transit agency shall own, operate, or lease

a fleet of urban buses with average NOx emissions in excess of 4.8 g/bhphr, based on new or repowered engine certification standards.

(1) This fleet average requirement shall be based on urban buses

owned, operated, or leased by the transit agency, including diesel

buses, alternative-fuel buses, all heavy-duty zero emission buses,

electric trolley buses, and articulated buses, in their fleet.

(2) Transit agencies may use ARB-certified retrofit systems to comply

with the fleet average requirement (in addition to bus purchases,

repowerings, and retirements).

(3) Transit agencies have the option of retiring all 1987 and earlier

model year diesel urban buses by October 1, 2002, to comply with

the fleet average standard requirement.

(e) To reduce public exposure to diesel particulate matter, transit agencies

and companies that lease buses to transit agencies shall participate in a

program to retrofit diesel buses in their fleet, and to operate their diesel

buses on diesel fuel with a maximum sulfur content of 15 parts per million.

Documentation of compliance with these requirements must be provided

in accordance with the provisions of subdivision (c) of section 1956.4,

(f) 13 CCR.

(1) By January 1, 2003, transit agencies shall not own, operate or

lease 1990 and earlier model year diesel, dual fuel, or diesel hybrid

buses in their active fleet, unless those buses have been retrofitted

as provided in (A), below, or are eligible for an exemption as

provided in (B), below. Transit agencies with less than 20 buses in

their active fleet, and that operate in federal ozone ambient air

quality standard attainment areas, are subject to this requirement

beginning January 1, 2007.

(A) The retrofit must be certified by the ARB as having an 85

percent or greater efficiency in reducing diesel particulate

matter.

(B) 1990 and earlier buses were originally certified to a PM

standard of 0.60 grams per brake horsepower-hour. Only

those 1990 and earlier buses that have been retrofitted to
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0.10 grams per brake horsepower-hour PM with an ARBcertified retrofit device (to meet the requirements of the U.S.

EPA urban transit bus rebuild and retrofit program, 85CFR,

sections 1401 through 1415) are eligible for the retirement

exemption provided in subsection (e)(4), below.

(2) Transit agencies shall not own, operate or lease 1991 through 1995

diesel, dual-fuel, or diesel hybrid transit buses in their active fleet,

unless the buses have been retrofitted according to the

requirements and schedule set forth in paragraphs (A) through (D),

below. Transit agencies with less than 20 buses in their active

fleet, and which operate in federal ozone ambient air quality

standard attainment areas, are exempt from paragraphs (A) and

(B), and subject to paragraph (C) beginning January 1, 2007.

(A) 20 percent of these buses shall be retrofitted by

January 1, 2003.

(B) 75 percent of these buses shall be retrofitted by

January 1, 2004.

(C) 100 percent of these buses shall be retrofitted by

January 1, 2005, except for those buses eligible for the

retirement exemption in subsection (e)(4), below.

(D) The retrofit must be certified by the ARB as having an 85

percent or greater efficiency in reducing diesel particulate

matter.

(3) Transit agencies shall not own or operate 1996 through 2003

diesel, dual-fuel, or diesel hybrid buses in their active fleet, unless

the buses have been retrofitted according to the following

requirements:

(A) 20 percent of these buses shall be retrofitted by

January 1, 2007.

(B) 75 percent of these buses shall be retrofitted by

January 1, 2008.

(C) 100 percent of these buses shall be retrofitted by

January 1, 2009, except for those buses eligible for the

retirement exemption in subsection (e)(4), below.
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(D) The retrofit must be certified by the ARB as having an 85

percent or greater efficiency in reducing diesel particulate

matter.

(4) Transit agencies must meet the 100 percent retrofit requirements in

subsections (1)(B), (2)(C), and (3)(C), above, except for those

buses that are within two years of retirement. Those buses within

two years of retirement are exempt from the retrofit requirements,

and retirement of the exempt buses must be documented in

accordance with section 1956.4(c)(2), below.

(5) Beginning July 1, 2002, transit agencies shall not operate diesel

buses on diesel fuel with a sulfur content in excess of 15 parts per

million.

(A) Transit agencies with less than 20 buses in their active

fleets, and which operate in federal ozone ambient air quality

attainment areas, are not subject to this requirement until

July 1, 2006.

NOTE: Authority cited: Sections 39600, 39601, 43013, 43018 Health and Safety Code.

Reference: Sections 39002, 39003, 39017, 39500, 39650, 40000, 43000, 43000.5,

43013, 43018, 43801, 43806 Health and Safety Code, and sections 233, 28114, 27157

Vehicle Code.
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SECTION 1956.3, TITLE 13, CCR

Add to Title 13, California Code of Regulations, new section 1956.3, to read:

1956.3 Zero Emission Bus Requirements

(a) "Zero emission bus" means an Executive Officer certified urban bus that

produces zero exhaust emissions of any criteria pollutant (or precursor

pollutant) under any and all possible operational modes and conditions.

(1) A hydrogen-fuel cell bus shall qualify as a zero emission bus.

(2) An electric trolley bus with overhead twin-wire power supply shall

qualify as a zero emission bus.

(3) A battery electric bus shall qualify as a zero emission bus.

(4) Incorporation of a fuel-fired heater shall not preclude an urban bus

from being certified as a zero emission bus, provided the fuel-fired

heater cannot be operated at ambient temperatures above 40BF

and the heater is demonstrated to have zero evaporative emissions

under any and all possible operational modes and conditions.

(b) Zero Emission Bus Demonstration Project – except as provided in (3)

below, the owner or operator of an urban bus fleet on the diesel path in

accordance with the provisions of section 1956.2, with more than 200

urban transit buses in its active fleet on January 31, 2001, shall implement

a demonstration project. The owner or operator shall evaluate the

operation of zero emission buses in revenue service, and prepare and

submit a report on the demonstration project to the Executive Officer for

inclusion in a future review of zero emission technology.

(1) This demonstration project shall meet all of the following

specifications and requirements:

(A) utilize a minimum of three zero emission buses,

(B) include any necessary site improvements,

(C) locate fueling infrastructure onsite,

(D) provide appropriate maintenance and storage facilities,

(E) train bus operators and maintenance personnel

(F) place the buses in revenue service for a minimum duration

of 12 calendar months,

(G) retain operation and maintenance records, and

(H) report on the demonstration program as set forth in

subdivision (d) of section 1956.4, 13 CCR.
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(2) When planning and implementing the demonstration project, the

operator or owner shall meet the following milestones:

(A) no later than January 1, 2002, prepare and solicit bid

proposals for materials and services necessary to implement

the demonstration project, including but not limited to the

zero emission buses and the associated infrastructure

(B) no later than July 1, 2003, place at least three zero emission

buses in revenue service, and

(C) no later than January 31, 2005, submit a report on the

demonstration project to the Executive Officer, in

accordance with section 1956.4 (d)(3), 13 CCR.

(3) Multiple transit agencies within the same air basin may, on a caseby-case basis, petition the Executive Officer to implement a joint

zero emission bus demonstration project. Electric trolley buses

shall not qualify as zero emission buses for purposes of this joint

demonstration project. No more than three transit agencies can

participate in any one joint project. Transit agencies that are

participating in a joint demonstration project shall:

(A) designate the agency hosting the onsite demonstration,

(B) jointly fund the demonstration project,

(C) place a minimum of three zero emission buses per

participating transit agency in revenue service,

(c) Purchase Requirement for Zero Emission Buses - The owner or operator

of a transit agency with more than 200 urban buses in active service on

January 1, 2007, for transit agencies on the diesel path, and January 1,

2009, for transit agencies on the alternative-fuel path, shall purchase

and/or lease zero emission buses, in accordance with the following:

(1) For transit agencies on the diesel path, in accordance with the

requirements in section 1956.2, a minimum 15 percent of purchase

and lease agreements, when aggregated annually, for model year

2008 through model year 2015 urban buses shall be zero emission

buses.

(2) For transit agencies on the alternative-fuel path, in accordance with

the requirements in section 1956.2, a minimum 15 percent of

purchase and lease agreements, when aggregated annually, for

model year 2010 through model year 2015 urban buses shall be

zero emission buses.

(3) The provisions of paragraphs (1) and (2) shall not apply if the

operator's urban bus fleet is composed of 15 percent or more zero
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emission buses on January 1, 2008, for transit agencies on the

diesel path, and on January 1, 2010, for transit agencies on the

alternative-fuel path, or at any time thereafter.

(d) The Air Resources Board shall review zero-emission bus technology and the

feasibility of implementing the requirements of section (c) above no later than

January 2006. Based on that assessment, the Board shall decide whether to

proceed with the implementation of the requirements.

NOTE: Authority cited: Sections 39600, 39601, 43013, 43018, 43100, 43101, 43104,

43806 Health and Safety Code, and sections 27157 Vehicle Code.

Reference: Sections 39002, 39003, 39017, 39018, 39500, 39701, 40000, 43000,

43000.5, 43009, 43013, 43018, 43102, 43801, 43806 Health and Safety Code, and

sections 27157 and 28114 Vehicle Code.
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SECTION 1956.4, TITLE 13, CCR

Add to Title 13, California Code of Regulations, new section 1956.4, to read:

1956.4 Reporting Requirements for all Urban Bus Transit Agencies and Leasing

Companies

(a) The following reports on new bus purchases and/or leases by transit

operators on the alternative-fuel path shall be submitted as described

below:

(1) The initial report shall be submitted by January 31, 2001 and shall

state the transit agency’s intent to qualify for the alternative-fuel

path.

(2) Any requests for deviation from the requirement that 85 percent of

buses purchased per year must be alternative-fuel buses must be

submitted in writing and approved by the Executive Officer of the

Air Resources Board 90 days prior to purchase.

(3) Transit agencies shall maintain, and produce upon request, records

regarding: the number, model year, and fuel used for engines in

transit buses they currently own or operate, bus purchases and/or

leases beginning January 1, 2000, annual average percentage of

total bus purchases and/or leases that were alternative-fuel buses.

(b) The following reports on the NOx fleet average requirement shall be

submitted as described below:

(1) initial documentation shall be submitted by January 31, 2001, and

contain, at a minimum, the active urban bus fleet NOx emission

average, and if that number exceeds the required average, a

schedule of actions planned to achieve that average by October 1,

2002, including numbers and model years of bus purchases,

retirements, retrofits, and/or repowerings, or, indicate the intent to

retire all model year 1987 and earlier buses in their active fleet by

October 1, 2002.

(2) a final report shall be submitted by January 31, 2003, detailing the

active urban bus fleet NOx emission average as of October 1,

2002, and actions, if any were needed, taken to achieve that

standard, including numbers and model years of bus purchases,

retirements, retrofits, and/or repowerings, or documenting the

retirement of all model year 1987 and earlier buses.
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(c) The following reports on the PM bus retrofit requirements shall be

submitted as described below:

(1) initial reports shall be submitted by the dates shown below and

shall contain, at a minimum, the following information:

(A) number and model year of diesel buses in the active fleet,

projected number and model year of buses to be retrofitted

annually, projected number and model year of exempt

buses, if any, and basis for exemption.

(B) a report for Tier 1 and Tier 2 requirements shall be submitted

by January 31, 2002.

(C) a report for Tier 3 requirements shall be submitted by

January 31, 2005.

(2) transit agencies shall maintain, and produce on request, records of

number and model year of diesel buses in the active fleet, number

and model year of buses retrofitted per year, retrofit devices used,

number and model year of exempt buses, if any, and basis for

exemption.

(d) The following reports on the zero-emission bus demonstration program

shall be submitted by those transit agencies required to conduct such

demonstrations as described below:

(1) initial documentation shall be submitted by January 31, 2003, and

contain, at a minimum, the bus order and delivery schedule, fuel

type, type of refueling station, any planned facility modifications,

and a revenue service demonstration plan

(2) a financial plan shall be submitted by January 31, 2003, and

contain, at a minimum, projected expenditures for capital costs for

purchasing and/or leasing buses, refueling stations, any facility

modifications, and projected annual operating costs

(3) a final report shall be submitted by January 31, 2005, and contain,

at a minimum, the following information:

(A) a brief description of the zero emission technology utilized,

identification of bus manufacturer and product specifications,

(B) miles driven per bus in revenue service, safety incidents,

driver and mechanic training conducted, and maintenance

(both scheduled and unscheduled),
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(C) qualitative transit personnel and passenger experience, and

(D) a financial summary of capital costs of demonstration

program, including bus purchases and/or leases, fueling

infrastructure, any new facilities or modifications, and annual

operating costs.

(e) The following reports on new zero-emission bus purchases and/or leases

shall be submitted by transit agencies required to purchase zero-emission

buses as described below:

(1) initial report shall be submitted by date shown below, and contain,

at a minimum, the following information:

(A) a brief description of the zero emission technology to be

utilized and a plan for the implementation of the requirement,

(B) for an exemption from the purchase requirement,

documentation that 15 percent or more of the transit

agency’s active urban bus fleet is composed of zeroemission buses.

(C) transit agencies on the diesel path shall submit report by

January 1, 2007.

(D) transit agencies on the alternative-fuel path shall submit

report by January 1, 2009.

(2) any requests for deviation from the requirement that 15 percent of

buses purchased per year must be zero-emission buses must be

submitted in writing and approved by the Executive Officer of the

Air Resources Board 90 days prior to purchase.

(3) transit agencies on the diesel path shall maintain, and produce

upon request, records regarding: the number, model year, and fuel

used in engines they currently own or operate, bus purchases

and/or leases beginning with model year 2008 and through model

year 2015, annual average percentage of total bus purchases

and/or leases that were zero-emission buses.

(4) transit agencies on the alternative-fuel path shall maintain, and

produce upon request, records regarding: the number, model year,

and fuel used in engines they currently own or operate, bus

purchases and/or leases beginning with model year 2010 and
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through model year 2015, annual average percentage of total bus

purchases and/or leases that were zero-emission buses.

NOTE: Authority cited: Sections 39600, 39601, 39659, 39701, 43018, 41511 Health and

Safety Code

Reference: Sections 39700, 39701, 41510, 41511, 43000, 43000.5, 43013, 43018,

43801, 43806 Health and Safety Code.
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SECTION 1956.8, TITLE 13, CCR

Amend Title 13, California Code of Regulations, section 1956.8, to read:

(Note: The regulatory amendments proposed for this are shown in underline to indicate

additions to the text, BOLD ITALICS to indicate added footnotes, and strikeout to indicate

deletions.)

1956.8 Exhaust Emission Standards and Test Procedures - 1985 and

Subsequent Model Heavy-Duty Engines and Vehicles

(a)(1) The exhaust emissions (A) from new 1985 and subsequent model heavy-duty

diesel engines (except methanol-fueled engines) and heavy-duty natural-gas-fueled and

liquefied-petroleum-gas-fueled engines derived from diesel-cycle engines, (B) from new

1991 and subsequent model heavy-duty methanol-fueled diesel transit bus engines,

and (C) from all new 1993 and subsequent model heavy-duty methanol-fueled, diesel

engines, except in all cases engines used in medium-duty vehicles, shall not exceed:

Exhaust Emission Standards

For 1985 – 2003 Model Heavy-Duty Engines

(grams per brake horsepower-hour)

Total Optional

Hydrocarbons Non-methane Carbon Oxides of

Model Year or OMHCEA HydrocarbonsA Monoxide Nitrogen Particulates

1985-1986 1.3 15.5 5.1 ---

1987B1.3 15.5 5.1 ---

1988-1989 1.3 15.5 6.0 0.60

1990 1.3 1.2 15.5 6.0 0.60

1991-1993C

 1.3 1.2 15.5 5.0 0.10

1991-1993D C1.3 1.2 15.5 5.0 0.25 E D

1994 -1997 1.3 1.2 15.5 5.0 0.10 E D

1994-1995F 1.3 1.2 15.5 5.0 0.07

1994-1995G  1.3 1.2 15.5 3.5 to 0.5 0.07
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1995-1997 J E1.3 1.2 15.5 3.5 to 0.5 0.10

1996-2003 F 1.3 1.2 15.5 4.0 I, O 

 0.05 H, O

1996-2003 G 1.3 1.2 15.5 2.5 to 0.5 0.05 H

1998-2003 K F1.3 1.2 15.5 4.0O,S G,H 0.10O G

1998-2003J E1.3 1.2 15.5 2.5 to 0.5TI0.10

A

 The total or optional non-methane hydrocarbon standards apply to petroleum-fueled,

natural-gas-fueled and liquefied-petroleum-gas-fueled engines. The Organic Material

Hydrocarbon Equivalent, or OMHCE, standards apply to methanol-fueled engines.

B As an option a manufacturer may elect to certify to the 1988 model-year emission

standards one year early, for the 1987 model year.

C For methanol-fueled engines, these standards shall be applicable beginning with the

1993 model year.

D Emissions averaging may be used to meet this standard. Averaging is restricted to

within each useful life subclass and is applicable only through the 1995 model year.

Emissions from engines used in urban buses shall not be included in the averaging

program.

E These are optional standards. A manufacturer may elect to certify to an optional NOx

standard between the values, inclusive, by 0.5 grams per brake horsepower-hour

increments. Engines certified to any of these optional NOx standards are not eligible

for participation in any averaging, banking or trading programs described in

"California Exhaust Emission Standards and Test Procedures for 1985 and

Subsequent Model Heavy-Duty Diesel Engines and Vehicles" incorporated in (b),

below.

F

 These are mandatory standards.

G Engines of 1998 through 2003 model years may be eligible to generate banking

credits based on these standards according to the requirements of the averaging,

banking and trading programs described in "California Exhaust Emission Standards

and Test Procedures for 1985 and Subsequent Model Heavy-Duty Diesel Engines

and Vehicles" incorporated in (b), below.

H

 May be used as the certification standard for the higher emitting fueling mode of an

engine certified under the dual fueling mode certification process of (a)(3), below.
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I

 May be used as the certification standard for the lower emitting fueling mode of an

engine certified under the dual fueling mode certification process of (a)(3), below.

Exhaust Emission Standards for Engines Used in October 2002

and Subsequent Model Heavy-Duty Engines and Vehicles

Model Year Oxides of

Nitrogen Plus

Non-methane

Hydrocarbons

Optional Oxides

of Nitrogen Plus

Non-methane

Hydrocarbons

Carbon

Monoxide

Particulate

Matter

2004 and subsequent C 2.4 L,P,S 2.5 M,P,S 15.5 0.05H,P

2004 September 30,

2002 and subsequent N

2.4 L,P,S 2.5 M,P,SB,C,E 15.5 0.10PC

2004 and subsequent C n/a 1.8 to 0.3 L,R,T 15.5 0.05H

2004 September 30,

2002 and subsequent

N

n/a 1.8 to 0.3 L,R,TA,D,F 15.5 0.10 0.03

to 0.01A,F,G

A

 The total or optional non-methane hydrocarbon standards apply to petroleum-fueled,

natural-gas-fueled and liquefied-petroleum-gas-fueled engines. The Organic Material

Hydrocarbon Equivalent, or OMHCE, standards apply to methanol-fueled engines.

B As an option a manufacturer may elect to certify to the 1988 model-year emission

standards one year early, for the 1987 model year.

C These standards apply to urban bus engines only.

D For engines other than urban bus engines. For methanol-fueled engines, these

standards shall be applicable beginning with the 1993 model year.

E Emissions averaging may be used to meet this standard. Averaging is restricted to

within each useful life subclass and is applicable only through the 1995 model year.

Emissions from engines used in urban buses shall not be included in the averaging

program. However, emissions from methanol-fueled, natural-gas-fueled and

liquefied-petroleum-gas-fueled urban bus engines certified to a 0.10 grams per brake

horsepower-hour standard for particulates for the 1991-1993 model years, and

certified to a 0.07 grams per brake horsepower-hour standard for particulates for the

1994-1995 model years, may be included in the averaging program for petroleumfueled engines other than urban bus engines.

F These mandatory standards apply to urban bus engines only.

G These optional standards apply to urban bus engines only. A manufacturer may

elect to certify to an optional NOx standard by 0.5 grams per brake horsepower-hour

increments. Engines certified to any of these optional NOx standards are not eligible
A-20

for participation in any averaging, banking or trading programs described in

"California Exhaust Emission Standards and Test Procedures for 1985 and

Subsequent Model Heavy-Duty Diesel Engines and Vehicles" incorporated in (b),

below.

H

 For in-use testing, a 0.07 gram per brake horsepower-hour standard for particulates

shall apply.

I

 A manufacturer may apply to the Executive Officer for an exemption from the 4.0

gram per brake horsepower-hour standard for oxides of nitrogen for 1996 and 1997

model year urban bus engines for which the manufacturer can demonstrate a

technological need for the exemption. The exemption or exemptions shall not

exceed 10 percent of the average of the manufacturer's total urban bus engine sales

in California for the three model years prior to the model year for which an exemption

is requested. The manufacturer shall submit technical justification for each engine

model and shall provide the number of urban bus engine sales in California for the

engine model for which the exemption is requested (if any) and for all urban bus

engine models for the three preceding model years, to the Executive Officer when the

manufacturer applies for the exemption.

J

 These are optional standards and apply to all heavy-duty engines excluding urban

bus engines. A manufacturer may elect to certify to an optional NOx standard

between the values, inclusive, by 0.5 grams per brake horsepower-hour increments.

Engines certified to any of these optional NOx standards are not eligible for

participation in any averaging, banking or trading programs described in "California

Exhaust Emission Standards and Test Procedures for 1985 and Subsequent Model

Heavy-Duty Diesel Engines and Vehicles" incorporated in (b), below.

K

 These mandatory standards apply to all heavy-duty engines except urban bus

engines.

L A

This is the standard for the arithmetic sum of the oxides of nitrogen exhaust

component certification value and the non-methane hydrocarbon exhaust component

certification value, without individual restriction on the individual component values.

MB

This is the standard for the arithmetic sum of the oxides of nitrogen exhaust

component certification value and the non-methane hydrocarbon exhaust component

certification value, with the non-methane hydrocarbon individual component value

not to exceed 0.5 g/bhp-hr.

N

 These standards apply to all heavy-duty engines except urban bus engines.

O

 Engines of 1998 through 2003 model years may be eligible to generate banking

credits based on these standards according to the requirements of the averaging,

banking and trading programs described in "California Exhaust Emission Standards
A-21

and Test Procedures for 1985 and Subsequent Model Heavy-Duty Diesel Engines

and Vehicles" incorporated in (b), below.

PC Emissions averaging may be used to meet this standard. Averaging must be based

on the requirements of the averaging, banking and trading programs described in

"California Exhaust Emission Standards and Test Procedures for 1985 and

Subsequent Model Heavy-Duty Diesel Engines and Vehicles" incorporated in (b),

below.

RD A manufacturer may elect to certify to an optional reduced-emission NOx+NMHC

standard between the values, inclusive, by 0.3 grams per brake horsepower-hour

increments. Engines certified to any of these optional reduced-emission NOx

standards are not eligible for participation in any averaging, banking or trading

programs described in "California Exhaust Emission Standards and Test Procedures

for 1985 and Subsequent Model Heavy-Duty Diesel Engines and Vehicles"

incorporated in (b), below.

SE May be used as the certification standard for the higher emitting fueling mode of an

engine certified under the dual fueling mode certification process of (a)(3), below.

TF May be used as the certification standard for the lower emitting fueling mode of an

engine certified under the dual fueling mode certification process of (a)(3), below.

G A manufacturer may elect to certify to an optional reduced-emission PM standard

between the values, inclusive, by 0.01 grams per brake horsepower-hour increments.

Engines certified to any of these optional reduced-emission PM standards are not

eligible for participation in any averaging, banking or trading programs described in

"California Exhaust Emission Standards and Test Procedures for 1985 and

Subsequent Model Heavy-Duty Diesel Engines and Vehicles" incorporated in (b),

below.

(2) Formaldehyde exhaust emissions from new 1993 and subsequent model methanolfueled diesel engines, shall not exceed:

Model Year Formaldehyde (g/bhp-hr)

1993-1995 0.10

1996 and subsequent 0.05

(3) An engine family whose design allows engine operation in either of two distinct

alternative fueling modes, where each fueling mode is characterized by use of one fuel

or a combination of two fuels and by significantly different emission levels under each

mode, may certify to a different NOx or NOx plus NMHC (as applicable depending on

model year) standard for each fueling mode, provided it meets the following

requirements:
A-22

(A) The NOx or NOx plus NMHC certification standard used for operation

under the higher emitting fueling mode must be one of the standards

denoted by footnote S in (a)(1).

(B) The NOx or NOx plus NMHC certification standard used for operation

under the lower emitting fueling mode must be one of the reducedemission standards denoted by footnote T in (a)(1).

(C) The engine family is not used to participate in any manufacturer's

averaging, banking or trading program.

(D) The engine family meets all other emission requirements contained in this

section.

(E) The higher emitting fueling mode must be intended only for fail-safe

vehicle operation when a malfunction or inadvertent fuel depletion

precludes operation in the lower emitting fueling mode, as evidenced by a

significantly reduced horsepower versus engine speed curve when

operating in the higher emitting fueling mode when compared to the

similar curve for the lower emitting fueling mode.

(b) The test procedures for determining compliance with standards applicable to 1985

and subsequent heavy-duty diesel engines and vehicles and the requirements for

participation in the averaging, banking and trading programs, are set forth in the

"California Exhaust Emission Standards and Test Procedures for 1985 and Subsequent

Model Heavy-Duty Diesel Engines and Vehicles", adopted April 8, 1985, as last

amended June 4, 1997, [insert date of finalized amendment], which is incorporated

herein by reference.

(c), (d), (e), (f), (g) [No Change]

(h) The exhaust emissions from new 1992 and subsequent model-year engines used in

incomplete medium-duty low-emission vehicles, ultra-low-emission vehicles, and superultra-low-emission vehicles, and for diesel engines used in medium-duty low-emission

vehicles, ultra-low-emission vehicles and super-ultra-low-emission vehicles shall not

exceed:
A-23

Exhaust Emission Standards for Engines Used in Incomplete Medium-Duty

Low-Emission Vehicles, Ultra-Low-Emission Vehicles, and Super

Ultra-Low-Emission Vehicles, and for Diesel Engines Used in Medium-Duty

Low-Emission Vehicles, Ultra-Low-Emission Vehicles, and

Super Ultra-Low-Emission VehiclesA,F

(grams per brake horsepower-hour)

Model Year Vehicle

Emissions

CategoryB

Carbon

Monoxide

Non-Methane

Hydrocarbons

and Oxides of

NitrogenC

Formaldehyde ParticulatesD

1992E -

2001

LEV 14.4 3.5 0.050 0.10

2002-2003ELEV 14.4 3.0 0.050 0.10

1992-

2003E,H

ULEV 14.4 2.5 0.050 0.10

2004 and

subsequent

ULEV -

Opt A.

14.4 2.5G,I,J 0.050 0.10J

2004 and

subsequent

ULEV -

Opt. B

14.4 2.4G,I,J 0.050 0.10J

1992 and

subsequent

SULEV 7.2 2.0 0.025 0.05

A

This set of standards is optional. Manufacturers of engines used in incomplete

medium-duty vehicles or diesel engines used in medium-duty vehicles from 8501-

14,000 pounds gross vehicle weight rating may choose to comply with these

standards as an alternative to the primary emission standards and test procedures

specified in section 1960.1, Title 13, California Code of Regulations. Manufacturers

that choose to comply with these optional heavy-duty standards and test procedures

shall specify, in the application for certification, an in-use compliance test procedure,

as provided in section 2139(c), Title 13, California Code of Regulations.

B

"LEV" means low-emission vehicle.

"ULEV" means ultra-low-emission vehicle.

"SULEV" means super ultra-low-emission vehicle.

C

This standard is the sum of the individual non-methane hydrocarbon emissions and

oxides of nitrogen emissions. For methanol-fueled engines, non-methane

hydrocarbons shall mean organic material hydrocarbon equivalent ("OMHCE").

D

This standard shall only apply to diesel engines and vehicles.
A-24

E Manufacturers may certify engines used in incomplete medium-duty vehicles or

diesel engines used in medium-duty vehicles to these standards to meet the

requirements of section 1956.8(g), Title 13, California Code of Regulations.

F

In-use compliance testing shall be limited to vehicles or engines with fewer than

90,000 miles.

G

[The U.S. EPA is considering the adoption of amendments to the federal emission

standards for engines used in incomplete medium-duty vehicles or diesel engines

used in medium-duty vehicles as they existed June 24, 1996. If the U.S. EPA

promulgates amendments to the emission standards for this category, the ARB will

hold a noticed public hearing within one year of such promulgation to consider the

adoption of similar or identical standards in California.]

H

For engines certified to the 3.5 grams per brake horsepower-hour (g/bhp-hr) LEV

standards, the in-use compliance standard shall be 3.7 g/bhp-hr for the first two

model years of introduction. For engines certified to the 2002 and 2003 model year

LEV standards, the in-use compliance standard shall be 3.2 g/bhp-hr. For engines

certified to the 1992 through 2003 model year ULEV standards, the in-use

compliance standard shall be 2.7 g/bhp-hr for the first two model years of

introduction. For engines certified to the 1992 and subsequent SULEV standards,

the in-use compliance standard shall be 2.2 g/bhp-hr for the first two model years of

introduction.

I Manufacturers have the option of certifying to either option A or B. Manufacturers

electing to certify to Option A must demonstrate that the NMHC emissions do not

exceed 0.5 g/bhp-hr.

J Emissions averaging may be used to meet these standards for diesel engines, using

the requirements for participation in averaging, banking and trading programs, as set

forth in the "California Exhaust Emission Standards and Test Procedures for 1985

and Subsequent Model Heavy-Duty Diesel Engines and Vehicles", adopted April 8,

1985, as last amended [insert date of finalized amendment], incorporated by

reference in paragraph (b), above.

NOTE: Authority cited: Sections 39600, 39601, 43013, 43018, 43101, 43103, 43104,

and 43806, Health and Safety Code, and section 28114, Vehicle Code.

Reference: Sections 39002, 39003, 43000, 43013, 43018, 43100, 43101, 43101.5,

43102, 43103, 43104, 43106, 43204, and 43806, Health and Safety Code.
A-25

AMENDMENTS TO THE CALIFORNIA EXHAUST EMISSION STANDARDS AND

TEST PROCEDURES FOR 1985 AND SUSEQUENT MODEL

HEAVY-DUTY DIESEL ENGINES AND VEHICLES
A-26

State of California

AIR RESOURCES BOARD

CALIFORNIA EXHAUST EMISSION STANDARDS

AND TEST PROCEDURES FOR 1985 AND SUBSEQUENT MODEL

HEAVY-DUTY DIESEL-ENGINES AND VEHICLES

Adopted: April 8, 1985

Amended: July 29, 1986

Amended: January 22, 1990

Amended: May 15, 1990

Amended: December 26, 1990

Amended: July 12, 1991

Amended: October 23, 1992

Amended: October 22, 1993

Amended: March 24, 1994

Amended: September 22, 1994

Amended: June 29, 1995

Amended: June 4, 1997

Amended: April 15, 1999

Amended: (insert date of finalized amendment)

NOTE: This document incorporates by reference various sections of the Code of

Federal Regulations (CFR), some with modifications. As noted, some of the current

modifications are to CFR sections already amended in California effective April 15,

1999. Modifications to portions of paragraphs in the Federal language are indicated by

underline for additions and strikeout for deletions. Larger portions of Federal language

for a specific section which is not to be included in these procedures are denoted by the

“DELETE” and larger portions of new California language are indicated by “REPLACE

WITH” or “INSERT”. The symbols “*****” and “.....” mean that the reminder of the

federal text for a specific section, which is not shown in these procedures, has been

included by reference, with only the printed text changed. The symbol “#####’ means

that the remainder of the text of these procedures, which is not shown in this

amendment document, has not been changed.
A-27

CALIFORNIA EXHAUST EMISSION STANDARDS AND TEXT PROCEDURES FOR

1985 AND SUBSEQUENT MODEL HEAVY-DUTY DIESEL ENGINES AND VEHICLES

The following provisions of Subparts A, I, and N, Title 40, Code of Federal Regulations,

as adopted or amended by the U. S. Environmental Protection Agency on the date

listed, and only to the extent they pertain to the testing and compliance of exhaust

emissions from heavy-duty diesel-engines and vehicles, are adopted and incorporated

herein by this reference as the California Exhaust Emission Standards and Test

Procedures for 1985 and Subsequent Model Heavy-Duty Diesel-Engines and Vehicles,

except as altered or replaced by the provisions set forth below.

The federal regulations contained in the Subparts identified above which pertain to

oxides of nitrogen emission averaging shall not be applicable to these procedures

except for diesel engines and vehicles produced in the 1998 and subsequent model

years. The federal regulations contained in the Subparts identified above which pertain

to particulate emission averaging shall not be applicable to these procedures for 1996

and subsequent model years. The smoke exhaust test procedures shall be applicable

to California petroleum-fueled, liquefied-petroleum gas-fueled, and compressed-natural

gas fueled heavy-duty diesel engines and vehicles for 1988 and later model years.

The federal regulations contained in the subparts identified above which pertain to

nonconformance penalty shall not be applicable.

The federal regulations contained in the subparts identified above which pertain to

evaporative emission shall not be applicable to these procedures. Applicable

regulations pertaining to evaporative emissions are contained in “California Evaporative

Emission Standards and Test Procedures for 1978 and Subsequent Model Motor

Vehicles,” as incorporated in Title 13, California Code of Regulations, Section 1976.

Starting with the 1990 model year, these regulations shall be applicable to all heavyduty Diesel natural-gas-fueled and liquefied-petroleum gas-fueled engines (and

vehicles) including those engines derived from existing Diesel engines. For any engine

which is not a distinctly Diesel engine nor derived from such, the Executive Officer shall

determine whether the engine shall be subject to these regulations or alternatively to the

heavy-duty Otto-cycle engine regulations, in consideration of the relative similarity of the

engine’s torque-speed characteristics and vehicle applications with those of Diesel and

Otto-cycle engines.

The regulations concerning the certification of methanol-fueled urban bus engines are

not applicable in California until 1991 and subsequent model years. The regulations

concerning the certification of all other methanol-fueled diesel engines and vehicles are

not applicable in California until 1993 and subsequent model years. Regulations

concerning the certification of incomplete medium-duty diesel low-emission vehicles and

engines and ultra-low-emission vehicles and engines operating on any fuel are

applicable for the 1992 and subsequent model years.
A-28

Subpart A, General Provisions for Emission Regulations for 1977 and Later Model Year

New Light-Duty Vehicles, Light-Duty Trucks, and Heavy-Duty Engines, and for 1985

and later Model Year New Gasoline-Fuel and Methanol Fueled Heavy-Duty Vehicles
A-29

Adopt and amend 86.098-11, Title 40, Code of Federal Regulations, (October 21, 1997)

as amended by the Air Resources Board effective April 15, 1999, to read:

86.098-11 emissions standards for 1998 and later model year diesel heavy-duty

engines and vehicles (October 21, 1997 as amended)

 (a) Exhaust emissions from new 1998 and later model year diesel heavy-duty engines

shall not exceed the following:

(1) DELETE

(2) DELETE

(3) Oxides of Nitrogen.

(i) 4.0 grams per brake horsepower-hour (1.49 grams per megajoule), as measured

under transient operating conditions.

(ii) A manufacturer may elect to include any or all of its diesel HDE families in the

banking portion of the NOx plus NMHC ABT programs for HDEs, within the restrictions

described in this section and § 86.098-15 as applicable.

 (4) Particulate.

(i) DELETE.

(ii) DELETE

(iii) A manufacturer may elect to include any or all of its diesel HDE families the

banking portion of the particulate ABT programs for HDEs, within the restrictions

described in this section and § 86.098-15 as applicable.

(A) DELETE

(B) DELETE

(C) DELETE

(b) DELETE

(c) DELETE

(d) DELETE

(e) (1) Reduced-emission exhaust emission standards for certain 1995 and later model

year heavy-duty diesel engines may be optionally selected as follows:
A-30

(i) A manufacturer may elect to certify 1996 through 2003 model year September 30,

2002 diesel engines for use in urban buses, to an optional reduced-emission oxides of

nitrogen standard between 0.5 grams per brake horsepower-hour and 2.5 grams per

brake horsepower-hour, inclusive, at 0.5 grams per brake horsepower-hour increments,

as measured under transient operating conditions. Engines certified to the standard

contained in this paragraph are not eligible to participate in NOx, NOx plus NMHC, or

particulate ABT programs.

(ii) A manufacturer may elect to certify 1995 through 1997 model year diesel engines for

use in vehicles with a Gross Vehicle Weight Rating of greater than 14,000 pounds

except urban bus engines, and 1994 through 1995 model year urban bus engines, to an

optional reduced-emission oxides of nitrogen standard between 0.5 grams per brake

horsepower-hour and 3.5 grams per brake horsepower-hour, inclusive, at 0.5 grams per

brake horsepower-hour increments, as measured under transient operating conditions.

Engines certified to a standard contained in this paragraph are not eligible to participate

in NOx, NOx plus NMHC, or particulate ABT programs.

(iii)(iv) A manufacturer may elect to certify 1998 through 2003 model year September

30, 2002 diesel engines, for use in vehicles with a Gross Vehicle Weight Rating of

greater than 14,000 pounds, other than urban transit buses, to an optional reducedemission oxides of nitrogen standard between 0.5 grams per brake horsepower-hour

and 2.5 grams per brake horsepower-hour, inclusive, at 0.5 grams per brake

horsepower-hour increments, as measured under transient operating conditions.

Engines certified to the standard contained in this paragraph are not eligible to

participate in NOx, NOx plus NMHC, or particulate ABT programs.

(iv) A manufacturer may elect to certify October 1, 2002 through model year 2003

diesel engines for urban buses for sale to transit agencies on the fleet rule diesel path,

to an optional reduced-emission oxides of nitrogen plus non-methane hydrocarbon

standard between 0.3 grams per brake horsepower-hour and 1.8 grams per brake

horsepower-hour, inclusive, at 0.3 grams per brake horsepower-hour increments, and a

particulate matter standard of 0.01 grams per brake horsepower-hour, 0.02 grams per

brake horsepower-hour, or 0.03 grams per brake horsepower-hour, as measured under

transient operating conditions. Engines certified to the standards contained in this

paragraph are not eligible to participate in NOx, NOx plus NMHC, or particulate ABT

programs.

(v) A manufacturer may elect to certify October 1, 2002 through model year 2006 diesel

engines for urban buses for sale to transit agencies on the fleet rule alternative-fuel

path, to an optional reduced-emission oxides of nitrogen plus non-methane hydrocarbon

standard between 0.3 grams per brake horsepower-hour and 1.8 grams per brake

horsepower-hour, inclusive, at 0.3 grams per brake horsepower-hour increments, and a

particulate matter standard of 0.01 grams per brake horsepower-hour, 0.02 grams per

brake horsepower-hour, or 0.03 grams per brake horsepower-hour, as measured under

transient operating conditions. Engines certified to the standards contained in this
A-31

paragraph are not eligible to participate in NOx, NOx plus NMHC, or particulate ABT

programs.

(vi) A manufacturer may elect to certify October 1, 2002 and later model year diesel

engines, for use in vehicles with a Gross Vehicle Weight Rating of greater than 14,000

pounds, other than urban transit buses, to an optional reduced-emission oxides of

nitrogen plus non-methane hydrocarbon standard between 0.3 grams per brake

horsepower-hour and 1.8 grams per brake horsepower-hour, inclusive, at 0.3 grams per

brake horsepower-hour increments, and a particulate matter standard of 0.01 grams per

brake horsepower-hour, 0.02 grams per brake horsepower-hour, or 0.03 grams per

brake horsepower-hour, as measured under transient operating conditions. Engines

certified to the standards contained in this paragraph are not eligible to participate in

NOx, NOx plus NMHC, or particulate ABT programs.

# # # # #
A-32

Adopt and amend 86.004-11, Title 40, Code of Federal Regulations, (October 21, 1997)

as amended by the Air Resources Board effective April 15, 1999, to read:

§ 86.004-11 Emission standards for 2004 and later model year diesel heavy-duty

engines and vehicles (October 21, 1997 as amended)

 (a)(1) Exhaust emissions from new 2004 and later model year diesel HDEs, other than

urban buses, shall not exceed the following:

(i)(A) Oxides of Nitrogen plus Non-methane Hydrocarbons (NOx + NMHC) for engines

fueled with either petroleum fuel, natural gas, or liquefied petroleum gas, 2.4 grams per

brake horsepower-hour (0.89 gram per megajoule), as measured under transient

operating conditions.

(B) Oxides of Nitrogen plus Non-methane Hydrocarbon Equivalent (NOx + NMHCE) for

engines fueled with methanol, 2.4 grams per brake horsepower-hour (0.89 gram per

megajoule), as measured under transient operating conditions.

(C) Optional Standard. Manufacturers may elect to certify to an Oxides of Nitrogen plus

Non-methane Hydrocarbons (or equivalent for methanol-fueled engines) standard of 2.5

grams per brake horsepower-hour (0.93 gram per megajoule), as measured under

transient operating conditions, provided that Non-methane Hydrocarbons (or equivalent

for methanol-fueled engines) do not exceed 0.5 grams per brake horsepower-hour (0.19

gram per megajoule) NMHC (or NMHCE for methanol-fueled engines), as measured

under transient operating conditions.

(D) A manufacturer may elect to include any or all of its diesel HDE families in any or all

of the emissions ABT programs for HDEs, within the restrictions described in § 86.004-

15 or superseding applicable sections. If the manufacturer elects to include engine

families in any of these programs, the NOx plus NMHC (or NOx plus NMHCE for

methanol-fueled engines) FELs may not exceed 4.5 grams per brake horsepower-hour

(1.7 grams per megajoule). This ceiling value applies whether credits for the family are

derived from averaging, banking, or trading programs. Additionally, families certified to

the optional standard contained in paragraph (a)(1)(i)(C) of this section shall not exceed

0.50 grams per brake horsepower-hour (0.19 gram per megajoule) NMHC (or NMHCE

for methanol-fueled engines) through the use of credits.

(E) DELETE

(ii) DELETE

(iv) Particulate.

(A) DELETE

(B) DELETE
A-33

(C) A manufacturer may elect to include any or all of its diesel HDE families in any or all

of the particulate ABT programs for HDEs, within the restrictions described in this

section and in § 86.004-15 or superseding applicable sections. If the manufacturer

elects to include engine families in any of these programs, the particulate FEL may not

exceed 0.25 gram per brake horsepower-hour (0.093 gram per megajoule).

(2) The standards set forth in paragraph (a)(1) of this section refer to the exhaust

emitted over the operating schedule set forth in paragraph (f)(2) of appendix I to this

part, and measured and calculated in accordance with the procedures set forth in

subpart N or P of this part, except as noted in § 86.098-23(c)(2) or superseding

sections.

(b) DELETE

(c) DELETE

(d) DELETE

(e) A manufacturer may elect to certify 2003 2004 and later model year diesel engines,

for use in vehicles with a Gross Vehicle Weight Rating of greater than 14.000 pounds,

other than urban transit buses, to an optional reduced-emission oxides of nitrogen

standard between 0.3 grams per brake horsepower-hour and 1.8 grams per brake

horsepower-hour, inclusive, at 0.3 grams per brake horsepower-hour increments, and a

particulate matter standard of 0.01 grams per brake horsepower-hour, 0.02 grams per

brake horsepower-hour, or 0.03 grams per brake horsepower-hour, as measured under

transient operating conditions. Engines certified to the standard contained in this

paragraph are not eligible to participate in NOx, NOx plus NMHC, or particulate ART

programs.

“*****”

(g)(1) exhaust emission from new 2004 through 2006 model year urban bus HDEs shall

not exceed the following:

(i)(A) Oxides of Nitrogen plus Non-methane Hydrocarbons (NOx + NMHC) for engines

fueled with either petroleum fuel, natural gas, or liquefied petroleum gas, 2.4 grams per

brake horsepower-hour (0.89 gram per megajoule), as measured under transient

operating conditions.

(B) Oxides of Nitrogen plus Non-methane Hydrocarbon Equivalent (NOx + NMHCE) for

engines fueled with methanol, 2.4 grams per brake horsepower-hour (0.89 gram per

megajoule), as measured under transient operating conditions.

(C) Optional Standard. Manufacturers may elect to certify to an Oxides of Nitrogen plus

Non-methane Hydrocarbons (or equivalent for methanol-fueled engines) standard of 2.5
A-34

grams per brake horsepower-hour (0.93 gram per megajoule), as measured under

transient operating conditions, provided that Non-methane Hydrocarbons (or equivalent

for methanol-fueled engines) do not exceed 0.5 grams per brake horsepower-hour (0.19

gram per megajoule) NMHC (or NMHCE for methanol-fueled engines), as measured

under transient operating conditions.

(D) A manufacturer may elect to include any or all of its diesel HDE families in any or all

of the emissions ABT programs for HDEs, within the restrictions described in § 86.004-

15 or superseding applicable sections. If the manufacturer elects to include engine

families in any of these programs, the NOx plus NMHC (or NOx plus NMHCE for

methanol-fueled engines) FELs may not exceed 4.5 grams per brake horsepower-hour

(1.7 grams per megajoule). This ceiling value applies whether credits for the family are

derived from averaging, banking, or trading programs. Additionally, families certified to

the optional standard contained in paragraph (a)(1)(i)(C) of this section shall not exceed

0.50 grams per brake horsepower-hour (0.19 gram per megajoule) NMHC (or NMHCE

for methanol-fueled engines) through the use of credits.

(E) Oxides of Nitrogen for engines for sale to transit agencies on the fleet rule diesel

path fueled with either petroleum fuel, natural gas, or liquefied petroleum gas, 0.5 grams

per brake horsepower-hour (0.02 gram per megajoule), or equivalent for methanolfueled engines, measured under transient operating conditions.

(F) A manufacturer may elect to include any or all of its diesel HDE families in any or all

of the emissions ABT programs for HDEs, within the restrictions described in § 86.004-

15 or superseding applicable sections. If the manufacturer elects to include engine

families in any of these programs, the NOx plus NMHC (or NOx plus NMHCE for

methanol-fueled engines) FELs may not exceed 4.5 grams per brake horsepower-hour

(1.7 grams per megajoule). This ceiling value applies whether credits for the family are

derived from averaging, banking, or trading programs. Additionally, families certified to

the optional standard contained in paragraph (a)(1)(i)(C) of this section shall not exceed

0.50 grams per brake horsepower-hour (0.19 gram per megajoule) NMHC (or NMHCE

for methanol-fueled engines) through the use of credits.

(ii)(A) Non-methane hydrocarbons for engines for urban buses for sale to transit

agencies on the fleet rule diesel path fueled with either petroleum fuel, natural gas, or

liquefied petroleum gas, 0.05 grams per brake horsepower-hour (0.02) gram per

megajoule), or equivalent for methanol-fueled engines, as measured under transient

operating conditions.

(iii) (A) Particulates for engines to be used in urban buses, 0.03 grams per brake

horsepower-hour (0.01 gram per megajoule) for certification testing and selective

enforcement audit testing, and 0.04 grams per brake horsepower-hour (0.02 gram per

megajoule) for in-use testing, as measured under transient operating conditions.

(B) A manufacturer may elect to include any or all of its diesel HDE families in any or all

of the particulate ABT programs for HDEs, within the restrictions described in this
A-35

section and in § 86.004-15 or superseding applicable sections. If the manufacturer

elects to include engine families in any of these programs, the particulate FEL may not

exceed 0.25 gram per brake horsepower-hour (0.093 gram per megajoule).

(B) Particulates for engines to be used in urban buses for sale to transit agencies on the

fleet rule diesel path, 0.01 grams per brake horsepower-hour (0.00 gram per megajoule)

for certification testing and selective enforcement audit testing, and 0.01 grams per

brake horsepower-hour (0.01 gram per megajoule) for in-use testing, as measured

under transient operating conditions.

(iv)(A) Carbon monoxide for engines to be used in urban buses for sale to transit

agencies on the fleet rule diesel path, 5.0 grams per brake horsepower-hour (1.9 gram

per megajoule) for certification testing and selective enforcement audit testing, and 7.0

grams per brake horsepower-hour (2.6 gram per megajoule) for in-use testing, as

measured under transient operating conditions.

(v)(A) Formaldehyde for engines used in urban buses for sale to transit agencies on the

fleet rule diesel path, 0.01 grams per brake horsepower-hour (0.0 gram per megajoule)

for certification testing and selective enforcement audit testing, and 0.01 grams per

brake horsepower-hour (0.01 gram per megajoule) for in-use testing, as measured

under transient operating conditions

(g) Optional Standards. As described in superceding applicable sections 86.098-11,

(October 21,1997 revised effective April 15, 1999) (e)(1)(i)(iv)(v) for urban buses