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- Latest available (Revised) - Welsh
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- Original (As made) - Welsh
Rheoliadau Safonau Ansawdd Aer (Cymru) 2007
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This is the original version (as it was originally made).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.
RHAN 2Ffiniau goddefiant ar gyfer bensen a nitrogen deuocsid
| Dechrau'r cyfnod pan fydd y ffin yn gymwys | Diwedd y cyfnod pan fydd y ffin yn gymwys | Bensen | Nitrogen deuocsid (gwerth terfyn bob awr ar gyfer diogelu iechyd pobl | Nitrogen deuocsid pobl) (gwerth terfyn blynyddol ar gyfer diogelu iechyd pobl) |
|---|---|---|---|---|
| Pan ddaw'r Rheoliadau hyn i rym | 31 Rhagfyr 2007 | 3 μg/m3 | 30 μg/m3 | 6 μg/m3 |
| 1 Ionawr 2008 | 31 Rhagfyr 2008 | 2 μg/m3 | 20 μg/m3 | 4 μg/m3 |
| 1 Ionawr 2009 | 31 Rhagfyr 2009 | 1 μg/m3 | 10 μg/m3 | 2 μg/m3 |
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