This global observation system will complement its efforts by integrating the monitoring sites that are part of other existing atmospheric monitoring programs such as the World Meteorological Organisation's Global Atmosphere Watch program (GAW), US and Canadian programs (i.e., CAMNet), the UN-ECE's European Monitoring and Evaluation Programme (EMEP) and the Arctic Monitoring and Assessment Program (AMAP).
WP-3 will be implemented through the following actions:
| Retrieval of past atmospheric mercury measurements from ground based sites around the world (see map) | |
| Establishment of GMOS ground-based monitoring sites and measurements at Master and Secondary Stations | |
| Training program for site managers | |
| Intercomparison campaigns | |
| Management of the continuous measurement program | |
| QA /QC of ground-based measurements | |
| Development of the data base reporting all ground-based measurements | |