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State and Federal Standards for Mobile-Source Emissions (2006)

Chapter: Appendix B Acronyms and Names Used for Classifying Organic Compounds

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Suggested Citation:"Appendix B Acronyms and Names Used for Classifying Organic Compounds." National Research Council. 2006. State and Federal Standards for Mobile-Source Emissions. Washington, DC: The National Academies Press. doi: 10.17226/11586.
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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.

Suggested Citation:"Appendix B Acronyms and Names Used for Classifying Organic Compounds." National Research Council. 2006. State and Federal Standards for Mobile-Source Emissions. Washington, DC: The National Academies Press. doi: 10.17226/11586.
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Emissions from mobile sources contribute significantly to air pollution in the United States. Such sources include cars and light- and heavy-duty trucks; diesel-powered cranes, bulldozers, and tractors; and equipment such as lawnmowers that run on small gasoline engines. The role of state versus federal government in establishing mobile-source emissions standards is an important environmental management issue. With this in mind, Congress called on EPA to arrange an independent study of the practices and procedures by which California develops separate emissions standards from the federal government and other states choose to adopt the California standards. The report provides an assessment of the scientific and technical procedures used by states to develop or adopt different emissions standards and a comparison of those policies and practices with those used by EPA. It also considers the impacts of state emissions standards on various factors including compliance costs and emissions. The report concludes that, despite the substantial progress in reducing emissions from mobile sources nationwide, more needs to be done to attain federal air-quality standards in many parts of the country. Additionally, California should continue its pioneering role in setting emissions standards for cars, trucks, and off-road equipment.

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