Laboratoire d'Aérologie Observatoire Midi-Pyrénées (LA UMR), Contribution to case studies for developed countries with insufficient Nr: West and Central Africa and Lake Victoria (LV) case studies. Key issues: air quality, greenhouse gas balance, atmospheric emission and deposition of Nr. Experience and partnership: coordination of the long term monitoring deposition network IDAF (IGAC-DEBITS-Africa), label WMO, partner of EADN (Equatorial Atmospheric Deposition Network), GEF UNEP Project. A French national proposal has been submitted for a pilot study in the LV catchment (partners: ILRI, University of Nairobi). Scientific objectives: Nr emission, wet and dry deposition measurements above soil and water, Atmospheric Nr budget and GES balance.