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Rheoliadau Safonau Ansawdd Aer (Cymru) 2010

Statws

This is the original version (as it was originally made).

Rheoliadau 13, 15, 20(1), (2), (4) a (5), 21(5), 23(1) a 24(2)

ATODLEN 1Gwerthoedd terfyn

Sylffwr deuocsid

Cyfnod cyfartaledduGwerth terfyn
Un awr350 μg/m3, sef ffigur na ddylid mynd yn uwch nag ef fwy na 24 o weithiau mewn blwyddyn galendr
Un diwrnod125 μg/m3, sef ffigur na ddylid mynd yn uwch nag ef fwy na 3 gwaith mewn blwyddyn galendr

Nitrogen deuocsid

Cyfnod cyfartaledduGwerth terfyn
Un awr na 18 o weithiau mewn blwyddyn galendr200 μg/m 3, sef ffigur na ddylid mynd yn uwch nag ef fwy
Blwyddyn galendr40 μg/m3

Bensen

Cyfnod cyfartaledduGwerth terfyn
Blwyddyn galendr5 μg/m3

Carbon monocsid

Cyfnod cyfartaledduGwerth terfyn
Y cymedr wyth awr dyddiol uchaf(1)10 mg/m3

Plwm

Cyfnod cyfartaledduGwerth terfyn
Blwyddyn galendr0.5 μg/m3

PM10

Cyfnod cyfartaledduGwerth terfyn
Un diwrnod na 35 o weithiau mewn blwyddyn galendr50 μg/m3, sef ffigur na ddylid mynd yn uwch nag ef fwy
Blwyddyn galendr40 μg/m3

PM2·5

Cyfnod cyfartaledduGwerth terfynY ffin goddefiantY dyddiad erbyn pryd y mae'n rhaid cyrraedd y gwerth terfyn
Blwyddyn galendr25 μg/m320% ar 11 Mehefin 2008, ac yn lleihau o ganrannau blynyddol hafal ar 1 Ionawr sy'n dilyn a phob 12 mis ar ôl hynny er mwyn cyrraedd 0% erbyn 1 Ionawr 20151 Ionawr 2015
(1)

Rhaid dewis y crynodiad cymedrig wyth awr dyddiol uchaf o garbon monocsid drwy archwilio'r cyfartaleddau cyfredol wyth awr, wedi eu cyfrifo ar sail data fesul awr ac wedi eu diweddaru bob awr. Rhaid neilltuo pob cyfartaledd wyth awr a gyfrifir felly i'r diwrnod pryd y daw i ben, hynny yw, bydd y cyfnod cyfrifo cyntaf ar gyfer unrhyw un diwrnod yn ymestyn o 17:00 ar y diwrnod blaenorol hyd 01:00 ar y diwrnod hwnnw, a'r cyfnod cyfrifo diwethaf ar gyfer unrhyw un diwrnod fydd y cyfnod rhwng 16:00 a 24:00 ar y diwrnod hwnnw.

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