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Rheoliadau Ansawdd Aer (Osôn) (Cymru) 2003
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RHAN I
Isafswm y pwyntiau samplu ar gyfer mesuriadau sefydlog parhaus i asesu ansawdd aer gyda golwg ar gydymffurfedd â'r gwerthoedd targed, yr amcanion hirdymor a throthwyon gwybodaeth a rhybuddio os mesuriadau parhaus yw'r unig ffynhonnell wybodaeth.
| Poblogaeth (x 1,000) | Crynoadau (trefol a maestrefol) (a) | Parthau eraill (maestrefol a gwledig) (a) | Cefndir Gwledig |
|---|---|---|---|
(a) o leiaf un orsaf mewn ardaloedd maestrefol, lle mae datguddiad uchaf y boblogaeth yn debyg o ddigwydd. Mewn crynoadau, dylai o leiaf 50 y cant o'r gorsafoedd fod wedi'u lleoli mewn mannau maestrefol. | |||
(b) 1 orsaf fesul 25,000 km2 yw'r argymhelliad ar gyfer tir cymhleth. | |||
| 0 — 250 | 1 | 1 orsaf/50,000 km2 fel dwysedd cyfartalog ar gyfer pob parth fesul gwlad (b) | |
| 251 — 500 | 1 | 2 | |
| 501 — 1,000 | 2 | 2 | |
| 1,001 — 1,500 | 3 | 3 | |
| 1,501 — 2,000 | 3 | 4 | |
| 2,001 — 2,750 | 4 | 5 | |
| 2,751 — 3,750 | 5 | 6 | |
| > 3,750 | 1 orsaf ychwanegol fesul 2 filiwn o drigolion | 1 orsaf ychwanegol fesul 2 filiwn o drigolion | |
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