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- Original (As made) - Welsh
Rheoliadau Gwerthoedd Terfyn Ansawdd Aer (Cymru) 2001
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This is the original version (as it was originally made). Dim ond ar ei ffurf wreiddiol y mae’r eitem hon o ddeddfwriaeth ar gael ar hyn o bryd.
Gwerthoedd terfyn sulphur dioxide
1.1
| Cyfnod Cyfartaleddu | Gwerth terfyn | Goddefiant(1) | Erbyn pryd y mae'n rhaid cyrraedd y gwerth terfyn | |
|---|---|---|---|---|
1. Terfyn gwerth fesul – awr ar gyfer diogelu iechyd pobl | 1 awr | 350 μg/m3, y mae'n rhaid peidio â mynd yn uwch nag ef fwy na 24 gwaith y flwyddyn galendr | 150 μg/m3 (43%) 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 | 1 Ionawr 2005 |
2. Gwerth terfyn dyddiol ar gyfer diogelu iechyd pobl | 24 awr | 125 μg/m3, y mae'n rhaid peidio â mynd yn uwch nag ef fwy na 3 gwaith y flwyddyn galendr | Dim un | 1 Ionawr 2005 |
3. Gwerth terfyn ar gyfer diogelu ecosystemau | Y flwyddyn galendr a'r gaeaf (1 Hydref i 31 Mawrth) | 20 μg/m3 | Dim un | 19 Gorffennaf 2001 |
(1)
Mae'r ffigurau ar gyfer Goddefiannau ar gyfer pob un o'r llygrynnau perthnasol a roddir yn yr Atodlen hon wedi'u cyfrifo o'r rhai a roddir yn Atodiad 1 i Gyfarwyddeb 99/30/EC. Rhoes honno ffigur uwchlaw gwerth terfyn pob llygryn perthnasol, gan ostwng yn ôl canrannau blynyddol cyfartal o'r dyddiad y daeth y Gyfarwyddeb honno i rym ym 1999.
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