1. AIRBASE, AIRVIEW and DEM wAIRBASE wAIRVIEW wDEMv4

2. AIRBASE, AIRVIEW and DEM wThree Layer Structure

3. AIRBASE, AIRVIEW and DEM wAIRBASE wMetadata (information about networks, stations and measurement configurations) wData (raw data, statistics) of 26 countries

4. AIRBASE, AIRVIEW and DEM wAIRVIEW wwww.etcaq.rivm.nl winformation winteractive access of AIRBASE wdown load DEM wmodel documentation system w………….

5. AIRBASE, AIRVIEW and DEM wDEM-Version 4 wBugs removed wConsolidation wNetwork Maintenance Form wStations Maintenance Form wMeasurement Configurations Form wImprovements wremoval added stations wremoval stations which are already in AIRBASE

6. AIRBASE, AIRVIEW and DEM wDEM-Version 4 (continued) wXML output wComplete connection with extended ISO wEMEP extensions

7. AIRBASE, AIRVIEW and DEM wTime table wDEMv4 release 1 (consolidation, XML, improvements)15th of june 2001 wdata delivery EoI: 1 October wDEMv4 release 2 (EMEP)end of september 2001 wdata delivery EMEP: 1 December

8. DEM v4 EMEP extensions wThree Layer Structure

9. DEM v4 EMEP extensions NASA AMES 1001DEMEBAS AIRBASE Additional metadata Emep stations Metadata EoI + Emep stations New metadata (both EoI and Emep) data Emep data EoI data

10. DEM v4 EMEP extensions wAll information of Nasa Ames 1001 in DEM wNot only hourly and daily raw data but also weekly, monthly and irregular data wcomply with new EBAS component list and units of measurement

11. DEM v4 EMEP extensions wDEM prefilled with meta information EMEP stations wnew list of quality flags wEMEP station code w………...

12. DEMv4 EMEP extensions wTime table wDetailed Design1 july 2001 wTesting15th of september 2001 wDEMv4 release 2 (EMEP)end of september 2001