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.



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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.