Definitive data representing Emissions of carbon dioxide for local authority areas during 2006 for every Local Authority (NUTS4) and Government Office (NUTS1) are now available. A revised version of the 2005 dataset has also been published alongside the 2006 data. Improvements to the way the data are produced mean the 2005 figures have been revised to make them comparable with the new methods used to calculate the 2006 figures. The 2005 and 2006 data are consistent and comparable with one another allowing change to be monitored over time.

The data are based upon LA CO2 estimates produced by AEA technology on behalf of defra. These National Statistics estimate all emissions in an area and have been modified slightly for this indicator to exclude certain emissions such as those from Motorways.