Emission factor from OCCC 2025
Compressed or vehicle natural gas (CNG) - Light commercial vehicles
Spain · Well-to-use · Any year
Each kilogram of this fuel counts as 3.28 kg CO₂e: 2.72 from burning it and 0.564 for producing it and bringing it to you (estimated).
Value for any year
3.28kgCO₂e/kg
Fossil only · GWP100 · AR5
FossilBio CH₄Land useBio CO₂EN 15804 GWP-fossilOne value, for any year
OCCC sets no date window, so there is no year to pick.
Reference year 2025
EstimatedAn estimate by open-climate.ai, not a number the publisher printed. Where a fuel publisher prints combustion only, we add the supply chain before the burn (well-to-tank), computed by one stated rule from the publisher's own combustion value and a published supply-chain ratio. Learn more Summed by open-climate.ai from 2 parts, 1 of them estimated by us
- Region
- Spain ES
- Boundary
- Well-to-use
- Data quality
- MediumRated by us, not by the source
- Licence
- Open · OCCC terms
Where 3.28 comes from
- Scope 12.7282.8%
- Fuel supplyEstimatedAn estimate by open-climate.ai, not a number the publisher printed. Where a fuel publisher prints combustion only, we add the supply chain before the burn (well-to-tank), computed by one stated rule from the publisher's own combustion value and a published supply-chain ratio. Learn moreDerived by open-climate.ai3.3 Energy upstream0.56417.2%
Σ 3.28: open-climate.ai adds up the two parts. OCCC prints fuel combustion. open-climate.ai estimates fuel supply from other published figures.
Reporting this kilogram under the GHG Protocol
Scope 1 2.72 3.3 Energy upstream 0.564
You burn the fuel, so its combustion is your Scope 1.
Supplying the fuel is Scope 3, category 3 for whoever burns it.
The factor, standardised
Every factor on open-climate.ai answers the same questions in the same words, whatever the publisher. Open any ⓘ for the definition.
Fuels › Gaseous fossil fuels · Spain · per kg · Average
Well-to-use · Fossil only · AR5
- BoundaryWell-to-useOne unit of energy as consumed, priced from the well to the point of use: the well-to-tank chain plus the burn for a fuel; generation, its well-to-tank and the transmission and distribution losses for a delivered carrier (electricity, steam or hot water, chilled water). Learn more
- Well-to-use
- Fuel supply and fuel combustion
- GWP methodWhich IPCC assessment report's warming potentials convert each gas to CO₂e, and over how many years the warming is counted (GWP100: 100 years). Learn more
- IPCC AR5, 100-year horizon
- Not on the record; set from OCCC's method notes
- CO₂e basisWhich carbon the CO₂e counts. Fossil only leaves out biogenic methane, land-use change and biogenic CO₂; excl. biogenic CO₂ counts biogenic methane but not the other two; net total counts every pool, net of removals. The same activity on two bases is two different numbers. Learn more
- Fossil onlyFossilBio CH₄Land useBio CO₂EN 15804 GWP-fossil
- Not split by gas; CO₂e only
Medium quality · Open licence · Any year
What this number covers
The path of one kilogram of this fuel, from the well to your flame. OCCC gives one figure for the first three steps together.
Well-to-tank0.5643.3 Energy upstream
Extraction
Getting the fuel out of the ground
Processing
Treating it to the quality it is sold at
Transport
Moving it to your site
Your record
1 kg in your records. The factor is per kg.
Burning it
In your boiler, furnace or engine: CO₂, with a little CH₄ and N₂O
Scope 12.72
0.564 + 2.72 = 3.28 per kg
Outside this boundary
- Making the boiler that burns it
- Building the pipelines and the network
OCCC counts the fuel, not the things built to extract, move and burn it.
Gases
OCCC publishes this factor as CO₂e only, with no split by gas. The CO₂e counts fossil carbon only; biogenic CO₂, biogenic methane and land-use carbon are left out.
From OCCC's record to a comparable factor
OCCC publishes one of the two parts; open-climate.ai estimated the others and added them all up to this total. Here is each field as printed and what open-climate.ai made of it.
The total and its parts
Each part has its own page. Use a part on its own when you report Scope 1 and Scope 3 separately; never add a part to the total.
About this factor
Source and licence
- Value
- Summed by open-climate.ai from its parts
- Publisher
- Oficina Catalana del Canvi Climàtic (Generalitat de Catalunya)
- Published
- 9 June 2026
The values and their metadata are served in full and may be reused with credit to the publisher.
Es permet la reutilització de documents i dades d'acord amb la Llei 37/2007, sempre que no s'alteri el contingut ni les metadades, no se'n desnaturalitzi el sentit, es citi la font i s'indiqui la data de l'última actualització.
Cite this factor
Oficina Catalana del Canvi Climàtic, Generalitat de Catalunya. Guia pràctica per al càlcul d'emissions de gasos amb efecte d'hivernacle (GEH), any 2025, edició 2026. Normalised by open-climate.ai, https://open-climate.ai/factors/libraries/occc_catalonia/ (CC BY 4.0). https://open-climate.ai/factors/ef-occccatalonia-gas_natural_comprimit_o-es-kg-well_to_use-c25c1aa8/?v=efv1-b63533233b13ee2c936c295803fd0c01
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