Non-Methane Hydrocarbon Equivalent

{
  "id": "MLC-T-ENV-018926",
  "term": "Non-Methane Hydrocarbon Equivalent",
  "field": "Environment",
  "definition": "1. Sum of the carbon mass emissions of non-oxygenated non-methane hydrocarbons plus the carbon mass emissions of alcohols, aldehydes, or other organic compounds which are separately measured in accordance with the applicable test procedures of 40 CFR part 86, expressed as gasoline-fueled vehicle non-methane hydrocarbons. In the case of exhaust emissions, the hydrogen-to-carbon ratio of the equivalent hydrocarbon is 1.85:1. In the case of diurnal and hot soak emissions, the hydrogen-to-carbon ratios of the equivalent hydrocarbons are 2.33:1 and 2.2:1 respectively.\n\n2. Sum of the carbon mass contributions of non-oxygenated nonmethane hydrocarbons, alcohols and aldehydes, or other organic compounds that are measured separately as contained in a gas sample, expressed as exhaust nonmethane hydrocarbon from petroleum-fueled engines. The hydrogen-to-carbon ratio of the equivalent hydrocarbon is 1.85:1.\n\n3. Sum of the carbon mass emissions of non-oxygenated nonmethane hydrocarbons, methanol, formaldehyde, or other organic compounds that are separately measured, expressed as gasoline-fueled vehicle hydrocarbons. In the case of exhaust emissions, the hydrogen-to-carbon ratio of the equivalent hydrocarbon is 1.85:1. In the case of diurnal and hot soak emissions, the hydrogen-to-carbon ratios of the equivalent hydrocarbons are 2.33:1 and 2.2:1, respectively.[40 CFR 86.094-2 (CFR 2018)]",
  "abbreviation": "NMHCE",
  "references": [
    "40 CFR 88.102-94 (CFR 2013)",
    "40 CFR 1065.1001 (CFR 2013)",
    "40 CFR 86.1803-01 (CFR 2018)"
  ],
  "url": "https://mlchart.com/terminology/environment/non-methane-hydrocarbon-equivalent/"
}