Coach, United Kingdom of Great Britain and Northern Ireland (GB)

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Background of emission factor

The emission factor for a long-distance coach indicates how much CO2 is produced per passenger per kilometer. Coaches produce fewer emissions than private cars with combustion engines, but they are not as low-emission as trains.

Emission factor category

Using public transport can reduce emissions from mobility. The emission factor for public transport depends significantly on the type of public transport vehicle used. Different public transport vehicles (trains, metros, buses, plains, ships) emit very different amounts of emissions and therefore the emission factors vary.

Coach

Emission factor category / Subcategory	Public transport
Country	United Kingdom of Great Britain and Northern Ireland (GB)
Organization	DEFRA, BEIS, DESNZ
Emission factor	34,32 g/hkm
CO2 / CO2 equivalent	CO2e
Quality of the emission factor
Updated	2025
Source	OpenCO2net/ Defra Conversion Factors 2025
More information	Well-to-wheel. Well-to-wheel. Average passenger occupancy is 17.56 passengers.Constituent gases (CO2, CH4, N2O) are only available for tank-to-wheel portion of emission factor. Defra source IDs: 25_314_3146_11_1, 25_314_3146_11_2, 25_314_3146_11_3, 25_314_3146_11_4, 26_910_3146_11_1

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Quality of emission factor

High-quality emission factors verified by an external verifier, usually sourced directly from the supplier (primary data). The factor may be a maximum of 3-5 years old and cover all greenhouse gases (CO2e).

Unverified primary data factors, as well as new and accurate average factors based on physical quantities. The factor may be a maximum of 3-5 years old.

Average, based on physical quantities, with one of the following shortcomings: more than 5 years old, only CO2 emissions, or contains many assumptions.

Inaccurate emission factors based on physical quantities that contain several of the following shortcomings: more than 5 years old, only CO2, or contains many assumptions. The newest, highest-quality spend-based emission coefficients also fall into this category.

Old and inaccurate spend-based emission factors. Their use in emission calculations should be avoided.