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Protokoll zur Verringerung von Versauerung, Eutrophierung und Bodennahem Ozon zum Übereinkommen über Weiträumige Grenzüberschreitende Luftverunreinigung von 1979
environ., UN	Gothenburg Protocol; 1999 Gothenburg Protocol to Abate Acidification, Eutrophication and Ground-level Ozone; Protocol to Abate Acidification, Eutrophication and Ground-level Ozone; Protocol to the 1979 Convention on Long-Range Transboundary Air Pollution to abate Acidification, Eutrophication and Ground-Level Ozone