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optionnox -- Optional Reduced NOx Emission Standards for Heavy-Duty Engines

Posted: 09 Dec 2014 17:10:08
Proposed Optional Reduced Emission Standards for Heavy-Duty
Engines are now in effect.  

 

On Friday, December 5, 2014, the Office of Administrative Law
approved the Proposal for Optional Reduced Emission Standards for
Heavy-Duty Engines.  The new regulation, which the Board approved
for adoption on December 12, 2013, establishes three optional
oxides of nitrogen (NOx) emission standards for heavy-duty
engines: 0.1 grams per brake horsepower-hour (g/bhp-hr), 0.05
g/bhp-hr, and 0.02 g/bhp-hr.  These optional standards are 50 to
90 percent lower than the current standard of 0.2 g/bhp-hr. The
formal regulatory documents are posted on the Heavy-Duty GHG
Phase 1 2013 webpage.

Background
 
Since 1990, the NOx exhaust emission standards for heavy-duty
on-road engines have significantly increased in stringency, from
6.0 g/bhp-hr to the current 0.2 g/bhp-hr standard, which was
phased in beginning in 2007.  In addition to these NOx standards,
ARB has also established several generations of optional, lower
NOx standards over the past 15 years. From 1998 to 2003, optional
NOx standards ranged from 2.5 g/bhp-hr to 0.5 g/bhp-hr, in 0.5
g/bhp-hr increments, which were much lower than the, then
current, 4.0 g/bhp-hr standard. Starting in 2004, engine
manufacturers could choose to certify to optional NOx +
non-methane hydrocarbon (NMHC) standards ranging from 1.8
g/bhp-hr to 0.3 g/bhp-hr, in 0.3 g/bhp-hr increments, which were
significantly below the, then current, 2.4 g/bhp-hr NOx+NMHC
standard. Such optional standards allowed local air districts and
ARB to preferentially provide incentive funding to the purchasers
of cleaner trucks, which encouraged the development of cleaner
engines.




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