Please refer to the guidance notes (either in PDF or within the spreadsheet 'Notes' page) for more information about the datasets provided below.
| Publication Year | Title | Emission factor | Notes |
| 2023 | Fleet Weighted Road Transport Emission Factor 2021 | Fleet Weighted Road Transport Emission Factor 2021
These datasets contain fleet weighted road transport emission factors by vehicle type, for hot exhaust, cold start exhaust, evaporative emissions and tyre and brake wear from the 2021 NAEI. | Guidance Note 2021 |
| 2023 | Primary NO2 Emission factors for road transport 2023 | Primary NO2 Emission factors for road transport (2023 version) | Primary NO2 Emission factors for Road Vehicles: 2023 version Guidance Note
Primary NO2 Emission Factors for Aviation and Other Transport Sources - Guidance |
| 2023 | Vehicle fleet composition projections (Base 2022) | Vehicle fleet composition projections (Base 2022)
The Base 2022 fleet composition projections data provided in this spreadsheet are consistent with those used in the 2020 NAEI (Base 2022) road transport emission projections for the UK, excluding London. They are the default fleet composition data incorporated in the Emission Factor Toolkit, EFT v12.0 (November, 2023). | |
| 2013 | Alternative vehicle technology emission factors | Alternative vehicle technology emission factors |
For previous versions of the above data, please see the Data Archive page.