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Rheoliadau Gwerthoedd Terfyn Ansawdd Aer (Cymru) 2001

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Cyfnod CyfartaledduGwerth terfynGoddefiantErbyn pryd y mae'n rhaid cyrraedd y gwerth terfyn
Gwerth terfyn blynyddol ar gyfer diogelu iechyd poblBlwyddyn galendr0.5 μg/m3100% ar 19 Gorffennaf 1999, gan ostwng ar 1 Ionawr 2001 a phob 12 mis wedyn yn ôl canrannau blynyddol cyfartal nes cyrraedd 0 % erbyn 1 Ionawr 2005.Ionawr 2005

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