Parameter Tree:
EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > CARBON AND HYDROCARBON COMPOUNDS > NON-METHANE HYDROCARBONS/VOLATILE ORGANIC COMPOUNDS

Definition:
Non-Methane Hydrocarbons (NMHCs) are hydrocarbons such as ethylene,
butane, hexane, propane and, by definition, exclude the first member of
that analogous series, CH4. Large quantities of NMHCs are emitted from
vegetation, the vast majority as isoprene, C5H8. This emission is
significant compared to that of anthropogenic NMHC. [Nature; v329;
705-707; 1987.] [Nature; v329; 705-707; 1987.]


Reference:
Atmospheric and Air Chemistry Glossary from the Sam Houston State University.
http://www.shsu.edu/~chemistry/Glossary/glos.html