In fluid measurement, a custody transfer point is a metering point at a location where the fluid is being measured for sale from one party to another.  This term can also denote the transfer of ownership along with related responsibilities and liabilities from one party to another.

The form of ignition that initiates combustion in a diesel engine. The rapid compression of air within the cylinders generates the heat required to ignite the fuel as it is injected.

Any vehicle certified by EPA as meeting certain federal emissions standards. The three categories of federal CFV standards from least to most stringent are low emission vehicles (LEVs), ultra-low emission vehicles (ULEVs), and zero emission vehicles (ZEVs). The inherently low emission vehicle (ILEV) standard is voluntary and does not need to be adopted by states as part of the Clean-Fuel Fleet Program. CFVs are eligible for two federal programs, the California Pilot Program and the Clean-Fuel Fleet Program.

Implemented by the U.S. Environmental Protection Agency as a provision of the Clean Air Act Amendments of 1990 to require cities with significant air quality problems to incorporate vehicles that will meet clean fuel emissions standards.

Fuel or power source that is used to certify a vehicle to the LEV, ILEV, ULEV, SULEV, or ZEV standard.

An evolving definition of diesel fuel with lower emission specifications, which strictly limit sulfur content to 0.05 weight %; in California, aromatics content is further limited to 10 volume % (for large refiners).

Signed into law in 1963, then amended in 1970, and again in 1990 (see Clean Air Act Amendments of 1990). Includes emissions standard for mobile and stationary sources. Enforced by the U.S. Environmental Protection Agency.



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