Developed through a partnership between Air Breizh and the Chambers of Agriculture of Brittany, AgrivisioN’air® is a free web-based decision- support tool that helps farmers, contractors, and cooperatives reduce ammonia emissions during manure and fertilizer spreading. The platform provides  three-day  forecasts  of  nitrogen  losses  due  to  ammonia volatilisation, based on spreading techniques and weather conditions. By anticipating these losses, users can adapt their practices to preserve the fertilizing value of livestock effluents and mineral fertilizers, while minimising environmental impact. Accessible via computer, tablet, or smartphone, the tool allows for quick simulations of spreading operations, offering insights on nitrogen loss, equipment efficiency, and weather- related volatilisation risks. Users can also create an account to track operations, adjust nitrogen inputs, and generate personalised summaries with economic indicators and nitrogen balance sheets by tool or product type.  AgrivisioN’air®  supports  short-term  improvements—such  as adjusting  application  timing  or  equipment  use—and  longer-term strategies,  including  investment  in  low-emission  technologies.  It contributes to both environmental and economic performance by reducing fertilizer waste, enhancing nitrogen availability for crops, and supporting sustainable manure management.