Work Package 6

Development of bottom-up inventory for Dublin

The objective of this work package is to develop a bottom-up inventory for Dublin based on the most detailed data available.


Related to ongoing activities in air quality modelling, it is interesting to look closer at a smaller area as a case study. Dublin has been selected as a suitable test area. Working on a city scale gives better opportunities for air quality modellers to compare the model results with results from air quality monitoring, to see how well the model complex of emission modelling, spatial modelling and dispersion modelling matches the measurements carried out. Another advantage of working bottom-up for a city like Dublin is that it will be possible to compare the bottom-up and top-down modelling, analyse the differences and get a better understanding of the uncertainties involved with the different approaches.

The work will focus on the main pollutants (NOx, SO2, NMVOC and PM2.5) for 2015 and will consider all sectors as included in the Nomenclature for Reporting (NFR) that is used in international reporting under the NECD and UNECE. In principle, all pollutants included in the Irish national emission inventories can be included.

The spatial distribution in the current national model are being improved through development of a bottom-up inventory for Dublin. Data sources for Dublin will be identified, that can allow for a more detailed spatial distribution than the result of the top-down model. Particular attention will be given to road transport and combustion installations that are not included as point sources in the national inventory. Regarding combustion for point sources, the aim will be to improve the inventory by identifying and including more detailed data on fuel combustion and information on specific industries within the four local authorities comprising Dublin. For road transport, it will be investigated if more detailed data are available for traffic in Dublin. The identification and use of detailed bottom-up data of high quality require cooperation with the local authorities in order to identify and gain access to relevant data and information.

A comparison of the bottom-up and top-down inventory will be made, using the Delta tool developed in the framework of FAIRMODE, and areas for improvement will be identified.