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H Glossary NO x or mono-nitrogen oxides: Refers to nitric oxide (NO) and nitrogen dioxide (NO 2 ), which are compounds formed during combustion. Phase I rule (or Phase I regulations): The regulation jointly promulgated by the U.S. Environmental Protection Agency and the National Highway Traffic Safety Administration on September 15, 2011, and published in the Federal Register (76 FR 5710 et seq.). NRC Phase One Committee: The committee of the National Research Council, formally the Committee to Assess Fuel Economy Technologies for Medium- and Heavy-Duty vehicles, which held its first meeting in December 2008 and in March 2010 delivered its final report, Technologies and Approaches to Reducing the Fuel Consumption of Medium- and Heavy-duty Vehicles. NRC Phase One Report: The report issued in 2010 by the National Research Council and published by The National Academies Press, entitled Technologies and Approaches to Reducing the Fuel Consumption of Medium- and Heavy-Duty Vehicles. PM 10 : Refers to particulate matter less than or equal to 10 microns in aerodynamic diameter (coarse particulate matter). PM 2.5 : Refers to particulate matter less than or equal to 2.5 microns in aerodynamic diameter (fine particulate matter). Volume limited: For trucks involved in goods movement, âvolume limitedâ refers to the situation in which the density of the freight is such that cargo volume is maximized without reaching the combined gross vehicle weight limit (typically 80,000 pounds for a Class 8 vehicle). Well-to-wheels: A specification for the envelope or boundary of an analysis defined to include and/or quantify the following: the extraction of the resource (e.g., petroleum or natural gas), the ultimate combustion of the fuel in the vehicle, and all steps in between to include refining, conversion, delivery, and so forth. Weight limited: For trucks involved in goods movement, âweight limitedâ refers to a situation in which the freight (e.g., beverages) are sufficiently gravimetrically dense that the combined gross vehicle weight limit is reached (typically 80,000 pounds for a Class 8 vehicle). Prepublication Copy â Subject to Further Editorial Correction H-1