techiaith/bydtermcymru-tm-en-cy huggingface dataset:
English: The table below shows the measures tested at each exceedance location with comments why they were not tested at certain sites as part of WelTAG Stage 3.
Welsh: Mae'r tabl isod yn dangos y mesurau a brofwyd ym mhob lleoliad lle y ceir gormodiant gyda sylwadau ynghylch pam na chawsant eu profi ar safleoedd penodol fel rhan o Gam 3 WelTAG.
English: Measures appraised by NO
Welsh: Mesurau a arfarnwyd yn ôl lleoliad lle ceir gormodiant o NO2
English: # For S4, impacts of barriers on air quality were not modelled explicitly and they were conservatively estimated to reduce roadside concentrations by a maximum of 2μg/m
Welsh: # Ar gyfer S4, ni chafodd effeithiau rhwystrau ar ansawdd aer eu modelu'n benodol ac amcangyfrifwyd yn geidwadol eu bod yn lleihau crynodiadau wrth ymyl y ffordd o 2μg/m
English: ## For S7, the effect of this measure is assessed on its own, but S7 is then also included as an existing measure in place for all other measures (F example, the S16 test is a test of S16+S7).
Welsh: ## Ar gyfer S7, asesir effaith y mesur hwn ar ei phen ei hun, ond yna mae S7 wedi'i gynnwys fel mesur presennol sydd ar waith ar gyfer pob mesur arall (Er enghraifft, mae prawf S16 yn brawf ar S16 +S7).
English: * This measure was carried forward from WelTAG Stage 2 assessments but was not considered further as part of WelTAG Stage 3 due to lack of suitable routes.
Welsh: * Cariwyd y mesur hwn ymlaen o asesiadau Cam 2 WelTAG ond ni chafodd ei ystyried ymhellach fel rhan o Gam 3 WelTAG oherwydd diffyg llwybrau addas.
English: A494 at Deeside (North Wales Zone)
Welsh: A494 yng Nglannau Dyfrdwy (Parth Gogledd Cymru)
English: The A494 through Deeside is a two lane dual carriageway.
Welsh: Mae'r A494 drwy Lannau Dyfrdwy yn ffordd ddeuol â dwy lôn.
English: Deeside is predominantly an industrial conurbation of towns and villages in Flintshire.
Welsh: Cytref o drefi a phentrefi yn Sir y Fflint yw Glannau Dyfrdwy yn bennaf.
English: It is close to the Wales- England border lying near the River Dee that flows from neighbouring Chester into the Dee Estuary.
Welsh: Mae'n agos i'r ffin rhwng Cymru a Lloegr ger Afon Dyfrdwy sy'n llifo o ardal gyfagos Caer i Aber Dyfrdwy.
English: Due to the river crossing and available road network in the area, diverting trunk road traffic (multi vehicle and high flows) options are limited.
Welsh: Oherwydd y croesiad dros yr afon a'r rhwydwaith ffyrdd sydd ar gael yn yr ardal, prin yw'r opsiynau ar gyfer dargyfeirio traffig cefnffordd (aml-gerbyd a llifau uchel).
English: To displace significant traffic volumes with routes going through local towns and villages, there is not a route which would lend itself to remove traffic and reduce traffic volumes significantly enough to have a major impact.
Welsh: Er mwyn cael gwared ar lefelau traffig sylweddol drwy ddefnyddio llwybrau sy'n mynd drwy drefi a phentrefi lleol, nid oes llwybr addas i gael gwared ar draffig a lleihau lefelau traffig yn ddigon i gael effaith sylweddol.
English: The Welsh Government is currently considering a bypass for the area as part of the A55 / A494 / A548:
Welsh: Mae Llywodraeth Cymru wrthi'n ystyried ffordd osgoi ar gyfer yr ardal fel rhan o'r A55 / A494 / A548:
English: Deeside Corridor, but a bypass cannot be completed in time to accelerate compliance with limit values.
Welsh: Coridor Glannau Dyfrdwy, ond ni ellir cwblhau ffordd osgoi mewn pryd i sicrhau cydymffurfiaeth â gwerthoedd terfyn yn gynt.
English: Table 5 shows the modelled impact of the measures selected through the WelTAG 3 process.
Welsh: Mae Tabl 5 yn dangos effaith wedi'i modelu y mesurau a ddewiswyd drwy broses Cam 3 WelTAG.
English: The table illustrates the impact of the various measures starting in 2017 (2017 is included for comparative purposes) with the baseline.
Welsh: Mae'r tabl yn dangos effaith y gwahanol fesurau yn dechrau yn 2017 (cafodd 2017 ei chynnwys er mwyn cymharu â'r llinell sylfaen).
English: Impact of measures on roadside annual mean concentrations (Equivalent PCM Concentration, μg/m
Welsh: Effaith mesurau ar groniadau cymedrig blynyddol wrth ymyl y ffordd (Crynodiad Mapio Hinsawdd Llygredd Cyfatebol, μg/m
English: The measure identified by the modelling as reducing levels in the shortest possible time is speed restrictions alongside variable diversions.
Welsh: Y mesur y nodwyd ei fod yn lleihau lefelau cyn gynted â phosibl yn ôl y gwaith modelu yw cyfyngiadau cyflymder ochr yn ochr â llwybrau gwyro amrywiadwy.
English: Given the marginal difference that variable diversions would make and taking into account the limited number of suitable alternative route these will not be pursued at this site.
Welsh: O ystyried y gwahaniaeth bach iawn y byddai llwybrau gwyro amrywiadwy yn ei wneud a nifer gyfyngedig y llwybrau amgen addas ni fwriedir parhau â'r rhain ar y safle hwn.
English: The modelling used in the table does not take account of the fact that the only viable alternative routes would require vehicles to either travel down Shotton Lane, a single track minor road or the B5125, which redirects traffic past a high school and day nursery.
Welsh: Nid yw'r gwaith modelu a ddefnyddiwyd yn y tabl yn ystyried y ffaith y byddai'r unig lwybrau amgen amrywiadwy yn golygu bod yn rhaid i gerbydau naill ai deithio i lawr Shotton Lane, isffordd un lôn neu'r B5125, sy'n ailgyfeirio traffig heibio i ysgol uwchradd a meithrinfa ddydd.
English: This not only gives rise to wider health and safety concerns but would also lead to a consequential drop in air quality around the school and day nursery which, although likely to remain compliant, is highly undesirable.
Welsh: Mae hyn nid yn unig yn codi pryderon ehangach ynglŷn ag iechyd a diogelwch ond byddai hefyd yn arwain at ostyngiad canlyniadol mewn ansawdd aer o amgylch yr ysgol a'r feithrinfa ddydd sydd, er ei fod yn debygol o barhau i gydymffurfio, yn hynod annymunol.
English: Public and local authority resistance to such a step would also be likely to delay the implementation of such a measure significantly.
Welsh: Byddai gwrthwynebiad y cyhoedd a'r awdurdod lleol i gam o'r fath hefyd yn debygol o achosi cryn oedi cyn y gellir rhoi mesur o'r fath ar waith.
English: Both routes add over ten minutes to the journey time.
Welsh: Mae'r naill lwybr a'r llall yn ychwanegu dros ddeng munud i'r amser teithio.
English: Therefore, drivers with local knowledge or using satellite navigation are unlikely to comply with the diversion.
Welsh: Felly, mae gyrwyr sydd â gwybodaeth leol neu sy'n defnyddio system llywio â lloeren yn annhebygol o gydymffurfio â'r gwyriad.
English: This significantly diminishes the impact of such a measure.
Welsh: Mae hyn yn lleihau effaith mesur o'r fath yn sylweddol.
English: It is noted that ramp metering alongside speed limits would reduce levels in a timespan marginally longer than variable diversions.
Welsh: Nodir y byddai'r mesuryddion ramp ynghyd â therfynau cyflymder yn lleihau lefelau ymhen cyfnod ychydig yn hwy na llwybrau gwyro amrywiadwy.
English: However, this would not be any sooner than speed restrictions alone and the implementation period needed for these is longer.
Welsh: Fodd bynnag, ni fyddai hyn yn gynt na chyfyngiadau cyflymder ar eu pennau eu hunain a byddai angen mwy o amser i'w rhoi ar waith.
English: Further, the length of the slip road would not be suitable for the method of control, causing traffic to queue onto the local road network and road safety issues.
Welsh: At hynny, ni fyddai hyd y ffordd ymadael yn addas ar gyfer y dull o reoli, gan achosi i draffig aros mewn ciw i ymuno â'r rhwydwaith ffyrdd lleol a phroblemau diogelwch ar y ffordd.
English: The installation of Air Quality Barriers has the potential to reduce concentrations significantly (3.0-4.4μg/m3).
Welsh: Gallai gosod Rhwystrau Ansawdd Aer leihau crynodiadau'n sylweddol (3.0-4.4μg/m3).
English: However, due to the time required for design including the potential need for planning permission, compliance with standards, technical approval (1.5 years) and construction (1.5 years) to implement this measure, the earliest date that these could be constructed is 2021 (3 years time).
Welsh: Fodd bynnag, oherwydd yr amser sydd ei angen i'w dylunio, gan gynnwys yr angen am ganiatâd cynllunio o bosibl, cydymffurfio â safonau, cymeradwyaeth dechnegol (1.5 blynedd) ac adeiladu (1.5 blynedd) i roi'r mesur hwn ar waith, y dyddiad cynharaf y gellid codi'r rhain yw 2021 (mewn 3 blynedd).
English: This is therefore not a measure which will mean compliance is achieved any sooner than speed restrictions alone.
Welsh: Felly, ni fydd y mesur hwn yn golygu y caiff cydymffurfiaeth ei sicrhau yn gynt na chyfyngiadau cyflymder ar eu pennau eu hunain.
English: This is a PRM.
Welsh: Mae hwn yn fesur rhagofalus a ddargedwir.
English: The Welsh Ministers have taken a considered decision that speed restrictions alone are the only measure that will achieve compliance with the NO
Welsh: Mae Gweinidogion Cymru wedi gwneud penderfyniad ystyriol mai cyfyngiadau cyflymder ar eu pennau eu hunain yw'r unig fesur a fydd yn sicrhau cydymffurfiaeth â'r gwerthoedd terfyn ar gyfer NO
English: A483 near Wrexham (North Wales Zone)
Welsh: A483 ger Wrecsam, (Parth Gogledd Cymru)
English: The A483 through Wrexham is a dual two lane carriageway.
Welsh: Mae'r A483 drwy Wrecsam yn ffordd ddeuol â dwy lôn.
English: It passes through a semi urban part of Wrexham with residential properties to one side of the A483 and industrial areas/farming fields to the other.
Welsh: Mae'n mynd drwy ran leddrefol o Wrecsam lle mae eiddo preswyl ar un ochr i'r A483 ac ardaloedd diwydiannol/caeau ffermio i'r llall.
English: Impact of measures on roadside annual mean concentrations (Equivalent PCM Concentration, μg/m
Welsh: Effaith mesurau ar groniadau cymedrig blynyddol wrth ymyl y ffordd (Crynodiad Mapio Hinsawdd Llygredd Cyfatebol, μg/m3) ar yr A483
English: The installation of Air Quality Barriers has the potential to reduce concentrations significantly (5.6μg/m3).
Welsh: Gallai gosod Rhwystrau Ansawdd Aer leihau crynodiadau'n sylweddol (5.6μg/m3).
English: However, due to the time required for design including the potential need for planning permission, compliance with standards, technical approval (1.5 years) and construction (1.5 years) to implement this measure the earliest date that these could be constructed is 2021 (3 years time).
Welsh: Fodd bynnag, oherwydd yr amser sydd ei angen i'w dylunio, gan gynnwys yr angen am ganiatâd cynllunio o bosibl, cydymffurfio â safonau, cymeradwyaeth dechnegol (1.5 blynedd) ac adeiladu (1.5 blynedd) i roi'r mesur hwn ar waith y dyddiad cynharaf y gellid codi'r rhain yw 2021 (mewn 3 blynedd).
English: They are therefore not a measure which will mean compliance occurs any sooner than speed restrictions alone, but this is has been identified as a PRM for the site.
Welsh: Felly, nid ydynt yn fesur a fydd yn golygu cydymffurfiaeth yn gynt na chyfyngiadau cyflymder ar eu pennau eu hunain, ond mae hwn wedi cael ei nod yn fesur rhagofalus a ddargedwir ar gyfer y safle.
English: Variable diversions would reduce concentrations, however, given the time to implement these in comparison with speed limits which reduce NO
Welsh: Byddai llwybrau gwyro amrywiadwy yn lleihau crynodiadau, ond, o ystyried yr amser sydd ei angen i'w rhoi ar waith o'u cymharu â therfynau amser sy'n lleihau amlygiad i NO
English: In addition, the A483 does not have a suitable alternative route that drivers would use without a closure of the slips roads.
Welsh: At hynny, nid oes gan yr A483 lwybr amgen addas y byddai gyrwyr yn ei ddefnyddio heb gau'r ffyrdd ymuno ac ymadael.
English: The A5152 could be utilised as an alternative route but it is twice the distance to use this route and the journey would be approximately 5 times longer than if drivers used the A483 to travel between Junctions 5 and 6.
Welsh: Gellid defnyddio'r A5152 fel llwybr amgen ond mae defnyddio'r llwybr hwn yn golygu dwywaith y pellter a byddai'r daith tua phum gwaith yn hirach na phe bai gyrwyr yn defnyddio'r A483 i deithio rhwng Cyffyrdd 5 a 6.
English: Drivers with local knowledge or who are using satellite navigation are unlikely to comply with the advisory variable diversion, significantly diminishing the impact of such a measure.
Welsh: Mae gyrwyr sydd â gwybodaeth leol neu sy'n defnyddio system llywio â lloeren yn annhebygol o gydymffurfio â'r llwybr gwyro amrywiadwy ymgynghorol, sy'n lleihau effaith mesur o'r fath yn sylweddol.
English: There are also more receptors affected on the A5152 than on the PCM link.
Welsh: Hefyd, effeithir ar fwy o dderbynyddion ar yr A5152 nag ar y cyswllt Mapio Hinsawdd Llygredd.
English: Based on the 2017 PCM model, the A483 will be compliant by the end of 2018 without any measures.
Welsh: Yn seiliedig ar fodel Mapio Hinsawdd Llygredd 2017, bydd yr A483 yn cydymffurfio erbyn diwedd 2018 heb unrhyw fesurau.
English: However, due to the potential variance with PCM data and to help ensure compliance is achieved in the shortest possible time, the Welsh Ministers have implemented the measure likely to achieve this outcome, 50mph speed limits at this site.
Welsh: Fodd bynnag, oherwydd yr amrywiad posibl â data Mapio Hinsawdd Llygredd ac er mwyn helpu i sicrhau cydymffurfiaeth cyn gynted â phosibl, mae Gweinidogion Cymru wedi rhoi'r mesur ar waith sy'n debygol o sicrhau'r canlyniad hwn, sef terfynau cyflymder o 50mya ar y safle hwn.
English: The 50mph speed limits will be reviewed when sufficient information is available to confirm compliance. This will be September 2019 at the earliest.
Welsh: Caiff y terfynau cyflymder o 50 mya eu hadolygu pan fydd digon o wybodaeth ar gael i gadarnhau cydymffurfiaeth, sef mis Medi 2019 fan cynharaf.
English: The Welsh Ministers have taken a considered decision that the speed restrictions alone are the only measure that will achieve compliance with the NO
Welsh: Mae Gweinidogion Cymru wedi gwneud penderfyniad ystyriol mai cyfyngiadau cyflymder ar eu pennau eu hunain yw'r unig fesur a fydd yn sicrhau cydymffurfiaeth â'r gwerthoedd terfyn ar gyfer NO
English: A470 between Upper Boat & Pontypridd (South Wales Zone)
Welsh: Cau ffyrdd ymuno/ymadael neu lwybrau gwyro amrywiadwy yw'r ffordd o sicrhau'r lleihad mwyaf mewn crynodiadau.
English: However, as already mentioned due to the diverted traffic needing to travel through local AQMAs there will be a displacement of the concentrations and increase in the concentrations by up to 10 μg/m
Welsh: Fodd bynnag, fel y crybwyllwyd eisoes, am y bydd angen i'r traffig gwyredig deithio drwy Ardaloedd Rheoli Ansawdd Aer bydd y crynodiadau yn cael eu dadleoli a byddant yn cynyddu hyd at 10 μg/m
English: Furthermore, the diversion route passes local schools, colleges and residential areas and is highly undesirable.
Welsh: At hynny, mae'r llwybr gwyro yn mynd heibio i ysgolion lleol, colegau ac ardaloedd preswyl ac mae'n hynod annymunol.
English: Ramp metering has the potential to reduce concentrations on the A470 (2.5-4.6μg/m
Welsh: Gallai mesuryddion ramp leihau crynodiadau ar yr A470 (2.5-4.6μg/m
English: Also as with the other sites, the A470 does not have sufficient slip roads to safely install ramp metering without queues forming on local roads and causing road safety concerns.
Welsh: Hefyd, yn yr un modd â'r safleoedd eraill, nid oes digon o ffyrdd ymuno/ymadael ar yr A470 i osod mesuryddion ramp yn ddiogel heb achosi ciwiau ar ffyrdd lleol a phryderon o ran diogelwch ar y ffordd.
English: Distance chevron markings have been reviewed for the site and due to the number of slip roads on the link and distance between the slip roads these may cause potential road safety concerns.
Welsh: Cafodd marciau ceibrau pellter eu hadolygu ar gyfer y safle ac oherwydd nifer y ffyrdd ymuno/ymadael ar y ffordd gyswllt a'r pellter rhwng y ffyrdd ymuno/ymadael gall y rhain achosi pryderon o bosibl o ran diogelwch ar y ffordd.
English: Options have been considered, including only having lane 2 of the link marked with chevrons.
Welsh: Mae opsiynau wedi cael eu hystyried, gan gynnwys dim ond rhoi marciau ceibrau ar lôn 2 o'r ffordd gyswllt.
English: However, this option will only produce half the effect with drivers either not using lane 2 or not being suitably separated when travelling in lane 1.
Welsh: Fodd bynnag, dim ond hanner yr effaith a gaiff ei sicrhau drwy'r opsiwn hwn, gyda gyrwyr yn dewis peidio â defnyddio lôn 2 neu beidio â chael eu gwahanu'n addas wrth deithio yn lôn 1.
English: When the chevron measure is considered alongside the speed limits, this brings the time period beyond that which can be achieved by the enforced speed limits alone and considering this, and the above issues, it has not been considered any further.
Welsh: Pan ystyrir y ceibrau ochr yn ochr â'r terfynau cyflymder, mae hyn yn golygu na fydd modd sicrhau cydymffurfiaeth yn gynt na'r terfynau cyflymder wedi'u gorfodi ar eu pennau eu hunain ac o ystyried hyn, a'r problemau uchod, nid yw'r mesur wedi cael ei ystyried ymhellach.
English: Parking improvements have the potential to reduce concentrations along the A470.
Welsh: Gallai'r gwelliannau parcio leihau crynodiadau ar hyd yr A470.
English: The South Wales Metro system is currently being designed and in time the A470 will have a series of park and ride sites provided along the route.
Welsh: Mae system Metro De Cymru yn cael ei dylunio ar hyn o bryd ac ymhen amser bydd gan yr A470 gyfres o safleoedd parcio a theithio ar hyd y llwybr.
English: However, due to land constraints, impacts on the rail network and current progress of the Metro in the area, the earliest date that this could be achieved is by the end of 2020 It is therefore a PRM.
Welsh: Fodd bynnag, oherwydd cyfyngiadau o ran tir, effeithiau ar y rhwydwaith rheilffyrdd a chynnydd presennol y Metro yn yr ardal, y dyddiad cynharaf y gellid cyflawni hyn yw erbyn diwedd 2020.
English: Air Quality Barriers have the potential to reduce concentrations, but as previously reported they require at least 3 years to implement.
Welsh: Gallai Rhwystrau Ansawdd Aer leihau crynodiadau, ond fel y nodwyd eisoes mae'n cymryd o leiaf dair blynedd i'w rhoi ar waith.
English: However, the measure has been retained as a PRM.
Welsh: Fodd bynnag, mae'r mesur wedi cael ei gadw fel mesur rhagofalus a ddargedwir.
English: Clean Air Zones have the potential to reduce concentrations on the link.
Welsh: Gallai Parthau Aer Glân leihau crynodiadau ar y ffordd gyswllt.
English: However, this needs some careful consideration due to the close proximity of the AQMAs.
Welsh: Fodd bynnag, mae angen ystyried hyn yn ofalus am ei bod yn agos i'r Ardaloedd Rheoli Ansawdd Aer.
English: Further work with the local authority is required to review the potential for the CAZ and therefore it has been retained as a PRM.
Welsh: Bydd angen gwneud rhagor o waith gyda'r awdurdod lleol i adolygu'r posibilrwydd o Barth Aer Glân ac felly mae wedi cael ei gadw fel mesur rhagofalus a ddargedwir.
English: In any event the implementation period brings the time at which a CAZ would begin reducing the levels beyond that achievable by speed restrictions alone.
Welsh: Sut bynnag, mae'r amser sydd ei angen i'w roi ar waith yn golygu na fyddai Parth Aer Glân yn dechrau lleihau'r lefelau yn gynt na'r hyn y gellir eu cyflawni drwy gyfyngiadau cyflymder ar eu pennau eu hunain.
English: The Welsh Ministers have therefore taken the considered decision that the enforced speed restrictions alone are the only measure that will achieve compliance with the NO
Welsh: Felly, mae Gweinidogion Cymru wedi gwneud penderfyniad ystyriol mai cyfyngiadau cyflymder ar eu pennau eu hunain yw'r unig fesur a fydd yn sicrhau cydymffurfiaeth â'r gwerthoedd terfyn ar gyfer NO
English: M4 between Junctions 25 & 26 (Newport) (South Wales Zone)
Welsh: M4 rhwng Cyffyrdd 25 a 26 (Casnewydd) (Parth De Cymru)
English: The M4 at Newport has the highest annual average daily traffic flow (circa 80,000100,000 vehicles per day).
Welsh: Ar yr M4 ger Casnewydd y gwelir y llif traffig dyddiol cyfartalog blynyddol uchaf (tua 80,000-100,000 o gerbydau y dydd).
English: The route cuts through a densely populated area of Newport and is constrained either side by retaining walls and steep embankments.
Welsh: Mae'r llwybr yn mynd drwy ardal hynod boblog Casnewydd ac mae wedi'i gyfyngu ar y naill ochr a'r llall gan waliau cynnal ac argloddiau serth.
English: It is within a cutting and due to the topography the eastbound traffic has a steep incline from Junction 25 east of 5%.
Welsh: Mae o fewn trychfa ac oherwydd y topograffi, i'r traffig i'r dwyrain mae llethr serth o 5% o Gyffordd 25 y dwyrain.
English: This gradient causes issues in particular for HGVs travelling through the area.
Welsh: Mae graddiant hwn yn achosi problemau, yn enwedig i gerbydau nwyddau trwm sy'n teithio drwy'r ardal.
English: In 2011, a Variable Speed Limit (VSL) system was installed to help improve traffic flow, reduce congestion and as a consequence improve air quality.
Welsh: Yn 2011, gosodwyd system Terfyn Cyflymder Newidiol er mwyn helpu i wella llif y traffig, lleihau tagfeydd a thrwy hynny wella ansawdd aer.
English: This VSL system is subject to enforcement via fixed speed camera.
Welsh: Mae'r system hon yn cael ei gorfodi drwy gamera cyflymder sefydlog.
English: At the time of writing there is a proposal to construct a corridor around Newport, the new M4.
Welsh: Ar adeg ysgrifennu'r darn hwn mae cynnig i adeiladu coridor o amgylch Casnewydd, yr M4 newydd.
English: This will lower the NO
Welsh: Bydd hwn yn lleihau'r crynodiadau o NO
English: This is currently awaiting a decision whether it will proceed to construction.
Welsh: Mae penderfyniad eto i'w wneud o ran p'un a fydd yn cael ei adeiladu.
English: If it does then the earliest date of opening is the end of 2023.
Welsh: Os caiff ei adeiladu, y dyddiad agor cynharaf wedyn yw diwedd 2023.
English: Impact of measures on roadside annual mean concentrations (Equivalent PCM Concentration, μg/m
Welsh: Effaith mesurau ar groniadau cymedrig blynyddol wrth ymyl y ffordd (Crynodiad Mapio Hinsawdd Llygredd Cyfatebol, μg/m3) ar yr M4 Cyffordd 25-26
English: Due to the traffic flow, topographical and highway layout through Newport, Link 40500 has no measures that will accelerate compliance until the end of 2021.
Welsh: Oherwydd y llif traffig, topograffi a threfn ffyrdd y briffordd drwy Gasnewydd, nid oes gan Gyswllt 40500 unrhyw fesurau a fydd yn sicrhau cydymffurfiaeth yn gynt tan ddiwedd 2021.
English: The greatest reduction can be achieved with the rerouting of traffic, variable diversion routes or junction closures.
Welsh: Y gostyngiad mwyaf y gellir ei gyflawni yw drwy ddargyfeirio traffig, llwybrau gwyro amrywiadwy neu gau cyffyrdd.
English: Closure of Junction 26 westbound off slip and eastbound on slip roads has the potential to achieve this but as referenced above (Table 3), this measure requires a traffic regulation order.
Welsh: Gallai cau ffordd ymadael i'r gorllewin a'r ffordd ymuno i'r dwyrain yng Nghyffordd 26 gyflawni hyn ond fel y nodir uchod (Tabl 3), bydd angen gorchymyn rheoli traffig ar gyfer y mesur hwn.
English: Furthermore, it only has a marginal difference to the variable diversions measure, which has the potential to achieve compliance in the shortest possible time as it does not require a traffic regulation order.
Welsh: At hynny, dim ond ychydig iawn o wahaniaeth sydd rhwng y mesur hwn a mesur llwybrau gwyro amrywiadwy, a allai sicrhau cydymffurfiaeth cyn gynted â phosibl gan nad oes angen gorchymyn rheoli traffig.
English: A Clean Air Zone does have the potential to reduce concentrations but will not accelerate compliance any quicker than a speed limit with variable diversions, due to the process and procedures involved in the implementation of a CAZ measure.
Welsh: Gallai Parth Aer Glân leihau crynodiadau ond ni fydd yn sicrhau cydymffurfiaeth yn gynt na therfyn cyflymder â llwybrau gwyro amrywiadwy, oherwydd y broses a'r gweithdrefnau sydd ynghlwm wrth fesur Parth Aer Glân.
English: The 50mph speed limit alone at this site does not reduce the concentrations as quickly and as much as a combination of a 50mph speed limit with variable diversions.
Welsh: Nid yw'r terfyn cyflymder o 50mya ar ei ben ei hun ar y safle hwn yn lleihau'r crynodiadau mor gyflym â chyfuniad o derfyn cyflymder o 50mya â llwybrau gwyro amrywiadwy, nac i'r un graddau.