Emission inventory Rotterdam
Topic of the practice
Rotterdam-Rijnmond has an emission Inventory for AQ modelling (derived from a national top down approach) for modelling on a 1x1 km scale. (3000 emissions points in a 20 x 40 km area). In addition a local traffic data for street canyon and motorway modelling (bottom-up) (15000 road segments) exists. Emissions for some 100 industrial point sources are reported annually to the regional authorities. All this constitues the local Emission Inventory.
Good Practice Information
The Rijnmond emission inventory is partly top down made by national institutes. It is pollutant specific so separate inventories for PM and NOx and other pollutants. A selection of the national data is acquired annually. Normally only the PM and NOx are used. In case of special projects the data for SO2, C6H6, etc. can be obtained. The national data (very complete!) are combined with regional spatial and activity information to further increase the spatial detail of the information. This applies mainly to traffic but also to shipping and to industrial point sources. (the largest industrial point sources are part of the national inventory as well).
At a national level the national environmental planning agency (PBL) and the central statistics office (CBS) as well as various ministerial committees are involved. The process is supported by several consultants (a.o. TNO). The regional work is carried out by DCMR, the regional EPA and the regional transport authorities for traffic numbers.A straightforward transfer of the practice is not possible though several approaches in collecting and compiling data could serve as examples for others.
Evidence of success
The practice is considered good because
> the emission inventory has a very high spatial resolution (1x1 km for generic sources and roads accurate within a m) and allows for detailed local and regional air quality modelling.
> contains a number of emission forecasts (typically 2015, 2020 and 2030) that are applicable at the generic 1x1 km scale, based on national economic scenario forecasts and assumptions on the impact of national policy. Regional traffic forecast may vary: usually at least two years.
> Due to the regionalised national emission totals we have data on evey sector of the economy that would normally not be available to local authorities. By combining it with bottom-up information on sources like traffic we combine the pros (and reduce the cons) of bottom-up and top down approaches.
Contact details to obtain further information on the practice
Sef v.d. Elshout
DCMR Environment Protection Agency Rijnmond
Annex completed on: 03-23-2011