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Rheoliadau Ansawdd Aer (Cymru) 2000

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Dehongli

1.—(1Cymedr blynyddol cyfredol yw cymedr a gyfrifir yn ôl yr awr, gan ildio un cymedr blynyddol cyfredol yr awr. Y cymedr blynyddol cyfredol ar gyfer sylwedd mewn lleoliad penodol am awr benodol yw cymedr y lefelau yn ôl yr awr ar gyfer y sylwedd hwnnw yn y lleoliad hwnnw am yr awr honno a'r 8759 o oriau blaenorol.

(2Er mwyn cyfrifo cymedr blynyddol cyfredol, y lefel yn ôl yr awr ar gyfer sylwedd mewn lleoliad penodol yw naill ai:

(a)y lefel lle cofnodir bod y sylwedd hwnnw yn bresennol yn yr aer yn y lleoliad hwnnw yn ystod yr awr ar sail sampl barhaus o aer a gymerir yn ystod yr awr honno am 30 munud o leiaf; neu

(b)cymedr y lefelau a gofnodir yn y lleoliad hwnnw ar sail 2 neu ragor o samplau o aer a gymerir yn ystod yr awr am gyfnod agregedig o 30 munud o leiaf.

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