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Appendix B Abbreviations and Names Used for Classifying Organic Compounds (NRC 1999) LOCI (volatile organic compound) Organic compounds that are found in the gas phase at ambient conditions. Might not include methane. ROG (reactive organic gas)Organic compounds that are assumed to be reactive at urban (and possibly regional) scales. Definitionally, taken as those organic compounds that are regulated because they lead to ozone formation. Does not include methane. The term is used predom- inantly in California. NMHC (nonmethane hydrocarbon) All hydrocarbons except methane; sometimes used to denote ROG. NMOC (nonmethane organic compound) Organic compounds other than methane. RHC (reactive hydrocarbon)All reactive hydrocarbons; also used to denote ROG. THC (total hydrocarbon) All hydrocarbons, sometimes used to denote VOC. OMHCE (organic material hydrocarbon equivalent) Organic compound mass minus oxygen mass. TOG (total organic gas) Used interchangeably with VOC. ~ ~ , ~ Unless noted otherwise, HC is the term used in this report to represent the general class of gaseous organic compounds. 193