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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. Background 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 standards.