Nonmethane organic gas (NMOG) means the combination of organic gases other than methane as calculated in 1066.635. Note that for this part, the organic gases are summed on a mass basis without any adjustment for photochemical reactivity.
40 CFR § 1066.1001
The definitions in this section apply to this part. The definitions apply to all subparts unless we note otherwise. Other terms have the meaning given in 40 CFR part 1065. The definitions follow: