Quality of rivers vis-à-vis ammonium in Brittany

Ammonium concentrations at all Breton sites monitored from 1995 to 2023. **Sources:** Naiades - OFB, OSUR - AELB, LYXEA - Dreal Bretagne, Ecoflux-IUEM. Processing: Environment Observatory in Brittany, 2024. **Go further:** consult the regulatory context and methodology in the datavisualisation <a href="https://bretagne-environnement.fr/boardboard/nitrogen-matters-non-nitrates-in-the-course-water-bretons-analysis-de-levolution" target="_blank">"Nitrogen substances (excluding nitrates) in Breton waterways: Analysis of annual developments since 1995"</a> by the EPO.