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Appendix B
Abbreviations and Names Used for
Classifying Organic Compounds
Common
Abbreviation Full Name
Definition
VOCa Volatile organic
compound
ROG Reactive organic gas
NMHC
Organic compounds that are found in the
gas phase at ambient conditions; might
not include methane
Organic compounds that are assumed to
be reactive at urban (and possibly
regional) scales; by definition, those
organic compounds that are regulated
because they lead to ozone formation;
does not include methane; term used
predominantly in California
All hydrocarbons except methane;
sometimes used to denote ROG
NMOC Nonmethane organic Organic compounds other than methane
compound
RHC Reactive hydrocarbon All reactive hydrocarbons; also used to
denote ROG
THC Total hydrocarbon All hydrocarbons, sometimes used to
denote VOC
OMHCE Organic material Organic compound mass minus oxygen
hydrocarbon equivalent mass
TOG Total organic gas Used interchangeably with VOC
aUnless noted otherwise, HC is the term used in this report to represent the general
class of gaseous organic compounds.
Source: Adapted from NRC (1999~.
233
Representative terms from entire chapter:
organic compound