Ghg Emission Factors: process
GHG emission factors for carbon footprint and greenhouse gas inventory calculations — 64 records across 6 source categories. Stationary combustion (natural gas, diesel, propane, coal, fuel oils, biomass) in kg CO2e per mmBtu or per physical unit. Mobile combustion (gasoline, diesel, jet fuel, marine) in kg CO2e per gallon. Electricity by 26 EPA eGRID2022 US subregions + national average in kg CO2e per MWh. Refrigerant GWP (R-134a through SF6) in kg CO2e per kg refrigerant. Process emissions (cement, steel, aluminum, lime). Waste (landfill, composting, recycling credits). Sources: EPA GHG Emission Factors Hub 2024, EPA eGRID2022, IPCC AR5 WG1 Annex II, 40 CFR Part 98, GHG Protocol Corporate Standard, EPA WARM v15.
| emission source type | record id | ch4 g per unit (g CH4/unit) | co2 kg per unit (kg CO2/unit) | co2e kg per unit (kg CO2e/unit) | fuel or source | gwp basis | n2o g per unit (g N2O/unit) | notes | unit notes | unit of activity |
|---|---|---|---|---|---|---|---|---|---|---|
| process | aluminum_primary_ton | 0 | 0 | 11,500 | aluminum primary smelting | AR5 | 0 | Includes PFC emissions (CF4 and C2F6) from anode effect + Hall-Heroult process CO2; global average; varies significantly by electricity source; secondary recycled aluminum ~95% lower | kg CO2e per metric ton primary aluminum (cradle to metal gate — smelting + anode) | metric ton aluminum |
| process | cement_clinker_ton | 0 | 0 | 842 | Portland cement clinker production | AR5 | 0 | Calcination reaction: CaCO3 → CaO + CO2; 842 kg CO2 per tonne clinker; combustion CO2 added separately; clinker-to-cement ratio ~0.9 for OPC | kg CO2e per metric ton clinker (process CO2 only — excludes combustion) | metric ton clinker |
| process | lime_ton | 0 | 0 | 785 | lime production (high-calcium quicklime) | AR5 | 0 | Calcination: CaCO3 → CaO + CO2; 0.785 t CO2/t lime; dolomitic lime ~0.913 t CO2/t lime; excludes fuel combustion CO2 | kg CO2e per short ton of high-calcium quicklime produced | short ton lime |
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