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Protokoll zu dem Übereinkommen von 1979 über weiträumige grenzüberschreitende Luftverunreinigung betreffend die Verringerung von Versauerung, Eutrophierung und bodennahem Ozon
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