Ammonia (NH3) is a gas involved in many environmental problems such as acidification of ecosystems, eutrophication and the presence of fine particles in the air. France is the biggest emitter of this gas in the European Union, with 649 kt in 2010. 97% of this ammonia is produced by agriculture (CITEPA) and especially livestock (75%), making this sector one of main levers for reducing emissions. At the initiative of ADEME, CITEPA (Interprofessional Technical Centre for Studies on Air Pollution) associated with the experts from the IFIP Pig-breeding institute, ITAVI and the IDELE Livestock Institute, has analysed 10 key and cost efficient actions across mainland France as a whole to reduce NH3 emissions from livestock production. These actions cover the three main livestock sectors (cattle, pigs and poultry) and target a wide variety of modes of action: feed and effluent management at the building, storage and manure-spreading levels. The study confirms a significant potential for reducing emissions in France, in particular through actions at the spreading and post-spreading stages. The "cost / effectiveness" ratios of the chosen practices give the following ranking: diet actions > spreading actions > storage actions > actions in farm buildings. All practices are described in sheets that indicate environmental impacts, the national reduction potential, cost effectiveness, opportunities and obstacles to development.