State of California

State Building
Auditorium - Room B-109
1315 Front Street
San Diego, CA

May 22, 1980
10:00 a.m.



80-10-1 Public Hearing to Consider Amendments to 001
Title 13, California Administrative Code, Regarding
the Extension of California's 1980 Heavy-Duty
Engine Emission Standards through the 1983 Model

80-10-2 Other Business
a. Research Proposals
b. Delegations to Executive Officer
c. Executive Session

ITEM NO.: 80-10-1

Proposed Amendments to Title 13, California Administrative Code,
Regarding the Extension of California's 1980 Heavy-Duty Engine
Emission Standards through the 1983 Model Year.


This staff report and recommendation is in response to petitions
from several heavy-duty engine manufacturers requesting the Air
Resources Board to extend the 1980 heavy-duty engine emission
standards to include 1983. The additional year is needed to
prevent a conflict with the new federal heavy-duty engine
emission regulations promulgated on January 21, 1980, by the
Environmental Protection Agency. The federal regulations are to
be implemented beginning in 1984.

The current California and federal standards are based upon the
"9 mode" (gasoline engines) and "13 mode" (diesel engines) test
procedures which are both steady-state methods of measuring
exhaust emissions. The new 1984 federal heavy-duty test
procedures, however, are based upon transient driving cycles
which are more representative of the on road heavy-duty truck
usage than the current steady-state procedures. The heavy-duty
engine transient cycle test is performed utilizing programmable
electric engine dynamometers rather than the vehicle chassis type
dynamometers used for light-duty vehicle emission testing.
Separate transient test cycles have been developed for gasoline
and diesel engines.

As a result of these new federal regulations, the industry is in
the process of purchasing the necessary analytical equipment and
modifying test facilities to accommodate the new transient
testing requirements. This creates a problem since facilities
changeover will be concurrent with the 1983 California
certification activities. A decision by manufacturers to delay
facilities conversion would not provide sufficient lead time for
meeting the 1984 federal requirements. The one year extension of
the 1980 emission standards will avert this conflict and avoid an
unnecessary one year recertification; 1983 on the 9-mode or 13-mode test
procedures and again a year later for 1984, assuming
the transient test procedures are eventually adopted for

Several manufacturers have also requested that California adopt
the federal heavy-duty test procedures and standards beginning
with 1984. It has been the Board's policy to adopt all
substantial changes to the federal emission test procedures in
order to provide programmatic consistency between the two
agencies for the industry. At the present time, it is premature
for the Board to consider changing California's heavy-duty engine
program for 1984 and beyond. However, the staff is developing a
proposal for the Board to consider adopting the new federal
hydrocarbon and carbon monoxide standards for 1984 and subsequent
model years along with the transient test procedures. The 1980
California NOx level of control (standard adjusted for transient
cycle) would be extended through 1984.

The staff will also propose that the Board adopt the new federal
NOx standard for 1985 assuming EPA promulgates the final rule as
scheduled. If EPA falls behind in its time schedule due to
litigation or administrative delays, the ARB will propose a
California NOx standard for 1985. In no case shall the NOx
standard be less stringent than the currently adopted 1983
California NOx standard. The staff is closely monitoring
developments on the federal level and expects to go before the
Board with the 1984 and subsequent model year proposal by early
fall 1980.

This proposal, therefore, deals only with a recommendation to
carryover the 1980 heavy-duty engine emission standards to
include the 1983 model year engines. These standards are 1.0
gram per brake-horsepower-hour hydrocarbons (1.0 HC), 25 grams
per brake-horsepower of carbonmonoxide (25 CO), and a combined
standard of 6.0 grams per brake-horsepower-hour of hydrocarbons
and oxides of nitrogen (6.0 HC + NOx), or optionally, standards
of 25 CO and 5.0 HC + NOx. These standards are applicable to the
current steady-state test procedures.