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• Experimental and literature review of internationally proposed critical levels for ammonia to protect the vegetation final report comprising the state of the art and the results from an ammonia fumigation experiment and a field gradient study : final report Franzaring, Jürgen ; Kösler, Julia ; Geupel, Markus (Hrsg.) Dessau-Roßlau : Umweltbundesamt, April 2024

• Review of internationally proposed critical levels for ammonia proceedings of an expert workshop held in Dessau and online on 28/29 March 2022 Franzaring, Jürgen (Hrsg.) ; Kösler, Julia (Hrsg.) ; Geupel, Markus (Hrsg.) Dessau-Roßlau : Umweltbundesamt, February 2023