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Definitions for "NMHC"
Keywords:  hydrocarbon, methane, ozone, nonmethane, byproducts
Nonmethane hydrocarbons - Byproducts of combustion that lead to ozone formation.
atp.nist.gov
Non-methane hydrocarbon(s). Hydrocarbon measurement which excludes methane. Methane is excluded as it is not a contributor to smog or ozone formation.
iangv.org
Non-Methane Hydrocarbons.
dieselnet.com