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onrdiesel -- Truck and Bus Regulation FAQs Updated

Posted: 09 Feb 2012 08:32:11
The California Air Resources Board (ARB or Board) staff has added
answers to frequently asked questions (FAQs) about the NOx Exempt
Area Extensions at:
http://www.arb.ca.gov/msprog/onrdiesel/documents.php. Other
topics already covered in the FAQs include the PM Filter Phase-In
Option and Credits, Small Fleet Extension, Log Truck Phase-In
Option, Low-Mileage Construction Truck Extension, and others. 


On December 11, 2008, the Board approved for adoption the Truck
and Bus regulation to control emissions from nearly all existing
diesel powered heavy-duty trucks and buses operating in
California.  The regulation became effective under California law
on January 8, 2010. On December 17, 2010, the staff recommended
amendments to the regulation that were subsequently adopted by
the Board on September 19, 2011. The Office of Administrative Law
approved the amendments on December 14, 2011 and the regulation
became effective on the same day.  The amended Truck and Bus
Regulation delays the initial requirement to phase-in
installation of PM filters by one year to January 1, 2012 and
extends the time before a vehicle equipped with a PM filter would
have to have an engine that meets 2010 model year emission
standards.  The amendments also defer initial engine replacements
for older vehicles without PM filters for two years until January
1, 2015 at the earliest.  Prior to 2020, replacements are limited
only to 20 year old or older trucks that are not equipped with PM
filters.  By January 1, 2023, most vehicles will need to be
equipped with an engine meeting 2010 model year emission

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