In 2021 we updated the Source Attribution dataset in APIS from emission year 2012 to a emission year 2018. In this data we included Ireland as a separate footprint source . An error has been discovered with the footprint calculations for Ireland and Europe. To calculate the footprints the model is run several times removing 75% of each source. Those layers are compared to the baseline to calculate the footprint for each source, but the Europe Import footprint was overestimated (as it included the Irish footprint).
For APIS Source Attribution pies this means that the proportion of all the sources of a site was affected especially those sites in Northern Ireland. The error has been fixed and the data re-calculated.
We apologise for any inconveniences this might have caused.