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OCR for page 325
State and Federal Standards for Mobile-Source Emissions
Appendix B
Acronyms and Names Used for Classifying Organic Compounds
Common Abbreviation
Full Name
Definition
VOC1
Volatile organic compounds
Organic compounds that are found in the gas phase at ambient conditions. Might not include methane.
ROG
Reactive organic gases
Organic compounds that are assumed to be reactive at urban (and possibly regional) scales. By definition, taken to be those organic compounds that are regulated because they lead to ozone formation. Does not include methane. The term is used predominantly in California.
NMHC
Nonmethane hydrocarbons
All hydrocarbons except methane; sometimes used to denote ROG.
NMOC
Nonmethane organic compounds
Organic compounds other than methane.
RHC
Reactive hydrocarbons
All reactive hydrocarbons; also used to denote ROG.
THC
Total hydrocarbons
All hydrocarbons, sometimes used to denote VOC.
OMHCE
Organic material hydrocarbon equivalent
Organic compound mass minus oxygen mass.
TOG
Total organic gases
Used interchangeably with VOC.
1Unless noted otherwise, HC is the term used in this report to represent the general class of gaseous organic compounds.
Source: NRC 1999.