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Protocollo alla convenzione del 1979 sull'inquinamento atmosferico oltre confine a lunga distanza relativo alla riduzione di emissione di zolfo o dei suoi flussi oltre confine di almeno il 30 per cento
environ.
Helsinki Protocol
;
Protocol to the Convention on Long-range Transboundary Air Pollution, on the Reduction of Sulphur Emissions or their Transboundary Fluxes by at least 30 per cent
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