techiaith/bydtermcymru-tm-en-cy huggingface dataset:
English: Development should not cause additional run-off, which can be achieved by controlling surface water as near to the source as possible by the use of SuDS.
Welsh: Ni ddylai datblygiad achosi dŵr ffo ychwanegol, a gellir sicrhau hyn drwy reoli dŵr ffo mor agos i'r ffynhonnell â phosibl drwy ddefnyddio SuDS.
English: Care should be taken in places of shallow groundwater or where flooding is caused by combined surface and groundwater processes.
Welsh: Dylid bod yn ofalus mewn mannau lle mae dŵr ffo bas neu pan achosir llifogydd gan gyfuniad o brosesau dŵr wyneb a dŵr daear.
English: In such situations direct infiltration SuDs may not be appropriate.
Welsh: Mewn sefyllfaoedd o'r fath efallai na fydd SuDS ymdreiddio uniongyrchol yn briodol.
English: Consultation with drainage bodies and NRW should be undertaken and relevant evidence and information drawn from Area Statements taken into account.
Welsh: Dylid ymgynghori â chyrff draenio a CNC ac ystyried tystiolaeth a gwybodaeth berthnasol o Ddatganiadau Ardal.
English: Flood defence works can provide opportunities to achieve wider social, economic and environmental benefits, which should be maximised where possible.
Welsh: Gall gwaith ar amddiffynfeydd llifogydd ddarparu cyfleoedd i gyflawni manteision economaidd, amgylcheddol a chymdeithasol ehangach, a dylid manteisio i'r eithaf ar y rhain lle bo'n bosibl.
English: Nature based solutions should be the first consideration given the opportunity to deliver other multiple benefits, including habitat creation, biodiversity enhancement and water quality improvements.
Welsh: O gael y cyfle i sicrhau manteision lluosog eraill, gan gynnwys creu cynefin, cyfoethogi bioamrywiaeth a gwella ansawdd dŵr, dylid rhoi'r ystyriaeth gyntaf i atebion sy'n seiliedig ar natur.
English: Overall, green infrastructure opportunities can benefit ecosystem resilience and provide opportunities for leisure facilities or renewable energy generation.
Welsh: Drwyddi draw, gall y cyfleoedd a roddir gan y seilwaith gwyrdd arwain at gryfhau ecosystemau a chreu cyfleoedd ar gyfer cyfleusterau hamdden neu gynhyrchu ynni adnewyddadwy.
English: This may involve consultation with emergency planners, local resilience forums and other professional partners such as fire rescue, police and ambulance services.
Welsh: Gallai hynny olygu ymgynghori â chynllunwyr gwasanaethau brys, fforymau cydnerthedd lleol a phartneriaid proffesiynol eraill fel y gwasanaethau tân ac achub, yr heddlu a'r gwasanaethau ambiwlans.
English: They are indicators of local environmental quality and integral qualities of place which should be protected through preventative or proactive action through the planning system.
Welsh: Maent yn ddangosyddion o ansawdd yr amgylchedd lleol a phriodoleddau annatod lle a ddylai gael eu gwarchod drwy gamau gweithredu ataliol neu ragweithiol drwy'r system gynllunio.
English: Conversely, air, noise and light pollution can have negative effects on people, biodiversity and the resilience of ecosystems and should be reduced as far as possible.
Welsh: Ar y llaw arall, gall llygredd sŵn a golau gael effeithiau negyddol ar bobl, bioamrywiaeth a chydnerthedd ecosystemau a dylid eu lleihau gymaint ag y medrir.
English: By which we mean the acoustic environment as perceived or experienced and/or understood by a person or people, in context (ISO definition)
Welsh: Sef yr amgylchedd acwstig yn ôl dirnadaeth neu brofiad a/neu ddealltwriaeth person neu bobl ohono, mewn cyd-destun.
English: Rather they represent a pragmatic threshold above which government considers the health risks associated with air pollution are unacceptable.
Welsh: Yn hytrach maent yn cynrychioli trothwy pragmataidd, ac os ydynt yn cael eu croesi, mae'r llywodraeth o'r farn bod y risgiau iechyd sy'n gysylltiedig â llygredd aer yn annerbyniol.
English: Air just barely compliant with these objectives is not 'clean' and still carries long-term population health risks.
Welsh: Nid yw aer sy'n cydymffurfio â'r amcanion hyn o drwch blewyn yn 'lân' ac mae'n peri risgiau iechyd hirdymor o hyd.
English: Nitrogen dioxide and particulate matter, which are the pollutants of primary national concern from a public health perspective, currently have no safe threshold defined and therefore the lower the concentration of those pollutants the lower the risks of adverse health effects.
Welsh: Nid oes trothwy diogel wedi'i ddiffinio hyd yma ar gyfer nitrogen deuocsid a deunydd gronynnol, sef y llygryddion sy'n destun y pryder mwyaf yn genedlaethol o safbwynt iechyd y cyhoedd, ac felly po isaf y crynodiad o'r llygryddion hynny, po isaf y risgiau o effeithiau iechyd andwyol.
English: It is desirable to keep levels of pollution as low as possible.
Welsh: Mae'n ddymunol cadw lefelau llygredd mor isel ag sy'n bosibl.
English: National air quality objectives contained in the Air Quality (Wales) Regulations 2000, as amended by the Air Quality (Wales) (Amendment) Regulations 2002.
Welsh: Yr amcanion ansawdd aer cenedlaethol a geir yn Rheoliadau Ansawdd Aer (Cymru) 2000, fel y'i diwygiwyd gan Reoliadau Ansawdd Aer (Cymru) (Diwygio) 2002.
English: Advice can be found in EPUK/IAQM guidance:
Welsh: Gweler y cyngor yng nghanllaw EPUK/IAQM:
English: The Welsh Government has published guidance on local air quality management (
Welsh: Mae Llywodraeth Cymru wedi cyhoeddi canllawiau ar reoli ansawdd aer yn lleol
English: Problematic forms of sound are generally experienced as noise pollution and can affect amenity and be prejudicial to health or a nuisance.
Welsh: Mae mathau problemus o sŵn yn cael eu profi fel llygredd sŵn a gallant effeithio ar amwynder a bod yn wael i iechyd neu'n niwsans.
English: Noise levels used to identify priority areas contained in noise action plans are usually set quite high in order to focus resources on the most polluted areas and noise must meet a number of tests before it qualifies as a statutory nuisance.
Welsh: Mae'r lefelau sŵn sy'n cael eu defnyddio i nodi ardaloedd â blaenoriaeth mewn cynlluniau gweithredu ar sŵn yn cael eu gosod yn eithaf uchel gan amlaf er mwyn sicrhau bod adnoddau'n cael eu clustnodi i'r ardaloedd mwyaf llygredig a rhaid i sŵn fodloni nifer o brofion cyn iddo gael ei gyfrif fel niwsans statudol.
English: Lower levels of noise, however, can still be annoying or disruptive and impact on amenity and as such should be protected through the planning process wherever necessary.
Welsh: Serch hynny, gall lefelau is o sŵn, fod yn annifyr neu'n drafferthus ac effeithio ar amwynder a dylid diogelu rhagddynt felly trwy'r broses gynllunio lle bo angen.
English: The planning system must protect amenity and it is not acceptable to rely on statutory nuisance under the Environmental Protection Act 1990
Welsh: Rhaid i'r system gynllunio ddiogelu amwynder ac nid yw'n dderbyniol dibynnu ar niwsans statudol o dan Ddeddf Diogelu'r Amgylchedd 1990
English: The Welsh Government has consulted on a noise and soundscape action plan for the period 2018-2023 (
Welsh: Mae Llywodraeth Cymru wedi ymgynghori ar gynllun gweithredu ynghylch sŵn a seinwedd 2018 2023
English: Part III Environmental Protection Act 1990.
Welsh: Rhan II o Ddeddf Diogelu'r Amgylchedd 1990.
English: Framework for Addressing Air quality and Soundscape
Welsh: Fframwaith ar gyfer Mynd i'r Afael ag Ansawdd Aer a Seinwedd
English: In doing so, it should consider the long-term effects of current and predicted levels of air and noise pollution on individuals, society and the environment and identify and pursue any opportunities to reduce, or at least, minimise population exposure to air and noise pollution, and improve soundscapes, where it is practical and feasible to do so.
Welsh: Trwy wneud hynny, dylai ystyried effeithiau hirdymor lefelau cyfredol a rhagamcanol o lygredd aer a sŵn ar unigolion, cymdeithas a'r amgylchedd; nodi a manteisio ar unrhyw gyfleoedd i leihau unrhyw gynnydd mewn lefelau cyfredol cysylltiad y boblogaeth â llygredd aer a sŵn, a gwella seinweddau, lle mae'n ymarferol ac yn hyfyw gwneud hynny.
English: The number of people exposed to the pollutant as well as the levels to which they are exposed.
Welsh: Nifer y bobl sy'n dod i gysylltiad â'r llygrydd a'r lefelau y maent yn dod i gysylltiad â nhw.
English: Air Quality and soundscape influence choice of location and distribution of development and it will be important to consider the relationship of proposed development to existing development and its surrounding area and its potential to exacerbate or create poor air quality or inappropriate soundscapes.
Welsh: Mae ansawdd aer neu seinwedd yn dylanwadu ar leoliad a gwasgariad datblygiad a bydd yn bwysig ystyried y berthynas rhwng datblygiad arfaethedig a datblygiad sy'n bod eisoes a'i gyffiniau a'i botensial i waethygu neu greu ansawdd aer gwael neu seinweddau amhriodol.
English: The agent of change principle says that a business or person responsible for introducing a change is responsible for managing that change.
Welsh: Mae egwyddor cyfrwng y newid yn dweud mai'r busnes neu'r person sy'n gyfrifol am gyflwyno newid sy'n gyfrifol am reoli'r newid hwnnw.
English: In practice, for example, this means a developer would have to ensure that solutions to address air quality or noise from nearby pre-existing infrastructure, businesses or venues can be found and implemented as part of ensuring development is acceptable.
Welsh: Yn ymarferol, er enghraifft, mae hynny'n golygu y byddai'n rhaid i'r datblygwr sicrhau y ceir hyd i atebion i fynd i'r afael ag ansawdd aer neu sŵn o seilwaith, busnesau neu neuaddau cyfagos a'u rhoi ar waith i sicrhau bod datblygiad yn dderbyniol.
English: address any implication arising as a result of its association with, or location within, air quality management areas, noise action planning priority areas or areas where there are sensitive receptors
Welsh: mynd i'r afael ag unrhyw oblygiad sy'n deillio o ganlyniad i'w gysylltiad ag ardaloedd rheoli ansawdd aer, ardaloedd blaenoriaeth cynlluniau gweithredu ar sŵn, neu ardaloedd lle ceir synwyryddion synhwyrol
English: Air quality management areas and noise maps may both be viewed at
Welsh: Cewch weld mapiau ardaloedd rheoli ansawdd aer a sŵn yn:
English: not create areas of poor air quality or inappropriate soundscape; and
Welsh: peidio â chreu ardaloedd lle ceir ansawdd aer gwael a llygredd sŵn;
English: seek to incorporate measures which reduce overall exposure to air and noise pollution and create appropriate soundscapes.
Welsh: ceisio ymgorffori mesurau sy'n lleihau cysylltiad cyffredinol â llygredd aer a sŵn a chreu seinweddau priodol.
English: Other mitigation measures must be capable of being effectively implemented for their intended purpose, and could include those related to:
Welsh: Rhaid i fesurau lliniaru eraill allu cael eu gweithredu'n effeithiol ar gyfer eu diben arfaethedig, a gallent gynnwys y rheini sy'n ymwneud â:
English: For more information on the principles of good acoustic design, readers are referred to Professional Planning Guidance (ProPG) Supplementary Document 2, produced by the Association of Noise Consultants, the Institute of Acoustics and the Chartered Institute of Environmental Health (
Welsh: Am ragor o wybodaeth am egwyddorion dylunio acwstig da, cynghorir darllenwyr i droi at y Canllaw Cynllunio Proffesiynol (ProPG), Dogfen Ategol 2, a gynhyrchwyd gan Gymdeithas yr Ymgynghorwyr Sŵn, yr Athrofa Acwsteg a Sefydliad Siartredig Iechyd yr Amgylchedd
English: ProPG has been written principally to assist with the planning process in England, but the design principles put forward in Supplementary Document 2 may also be adopted in Wales.
Welsh: Cafodd y ProPG ei lunio'n bennaf i helpu â'r broses gynllunio yn Lloegr, ond gallai'r egwyddorion dylunio a geir yn Nogfen Ategol 2 gael eu mabwysiadu yng Nghymru.
English: traffic management and road safety;
Welsh: rheoli traffig a diogelwch ffordd;
English: ensuring progress towards a shift to low or zero emissions means of road transport, such as electrical charging points;
Welsh: sicrhau cynnydd tuag at newid i foddau o drafnidiaeth ffordd allyriadau isel neu sero, fel pwyntiau gwefru trydanol;
English: supporting low or zero emissions public transport;
Welsh: cefnogi trafnidiaeth gyhoeddus allyriadau isel neu sero;
English: providing active travel infrastructure;
Welsh: darparu seilwaith teithio llesol;
English: incorporating green infrastructure, where it can improve air quality by removing air pollution and aiding its dispersal, reduce real or perceived noise levels by absorbing and scattering noise and introducing natural sounds to soften man-made noise, provide areas of relative tranquillity, and reduce exposure by putting a buffer between sources of pollution and receptors.
Welsh: ymgorffori seilwaith gwyrdd, lle gall wella ansawdd aer drwy gael gwared ar lygredd aer a'i gynorthwyo i wasgaru, lleihau lefelau sŵn go iawn neu dybiedig drwy amsugno a gwasgaru sŵn a chyflwyno synau naturiol i dawelu sŵn gwneud, darparu ardaloedd o lonyddwch cymharol, a lleihau cysylltiad drwy osod clustogfa rhwng ffynonellau a derbynyddion llygredd.
English: This may particularly be the case when proposing high density developments adjacent to transport hubs or where development pressure to meet short-term needs may have detrimental long-term effects and care must be taken not to exacerbate health inequalities whilst recognising accessibility needs.
Welsh: Hynny yn arbennig wrth gynnig datblygiadau dwysedd uchel wrth hybiau trafnidiaeth neu pan allai pwysau datblygu i ddiwallu anghenion tymor byr gael effeithiau tymor hir andwyol. Rhaid gofalu peidio â gwaethygu'r anghydraddoldebau iechyd wrth gydnabod yr angen i gael mynediad.
English: It will be important to identify wider mitigation solutions to reduce air and noise pollution and to avoid exacerbating problems in existing air quality management areas or noise hotspots through the provision of green infrastructure identified as part of Green Infrastructure Assessments, by the provision of electric vehicle charging infrastructure or through promoting the need to consider effective design solutions.
Welsh: Bydd yn bwysig cael hyd i fesurau lliniaru ehangach i leihau llygredd aer a sŵn ac i osgoi gwaethygu problemau mewn ardaloedd rheoli ansawdd aer neu fannau swnllyd trwy ddarparu'r seilwaith gwyrdd a nodwyd fel rhan o'r Asesiadau o'r Seilwaith Gwyrdd, trwy ddarparu mannau gwefru cerbydau electronig neu drwy hyrwyddo'r angen i ystyried atebion dylunio effeithiol.
English: Planning authorities should work closely with bodies such as the Public Service Boards in the preparation of their well-being plans and seek input from their own Environmental Health departments.
Welsh: Dylai awdurdodau cynllunio weithio'n agos â chyrff fel y Byrddau Gwasanaeth Cyhoeddus wrth baratoi eu cynlluniau llesiant a cheisio mewnbwn oddi wrth adrannau Iechyd yr Amgylchedd.
English: Understanding and Identifying the Sources of Airborne (Air and Noise) Pollution
Welsh: Deall a Nodi Ffynonellau Llygredd Aer (Aer a Sŵn)
English: Consequently, areas of poor air quality often coincide or overlap with areas subject to high noise levels.
Welsh: O ganlyniad, mae ardaloedd o ansawdd aer gwael yn cyd-ddigwydd neu'n gorgyffwrdd ag ardaloedd â lefelau uchel o sŵn.
English: Even where they do not, poor air quality at one location and high levels of noise at a neighbouring location may be related to one another, depending on the characteristics of the place in question, including the way in which people use and occupy places and the way in which traffic is managed in the wider area.
Welsh: Hyd yn oed os nad yw hynny'n wir, gall fod cysylltiad rhwng ansawdd aer gwael mewn un lleoliad a lefelau uchel o sŵn mewn lleoliad cyfagos, yn dibynnu ar nodweddion y lle dan sylw, yn cynnwys y ffordd y mae pobl yn defnyddio ac yn meddiannu lleoedd, a'r ffordd y mae traffig yn cael ei reoli yn yr ardal ehangach.
English: Where air and noise pollution are generated from the same source they should be considered and addressed together and links should be made with active travel and other strategies for reducing vehicular use so as to reduce or minimise, pollution and to ensure an appropriate soundscape.
Welsh: Lle mae llygredd aer a sŵn yn cael eu cynhyrchu gan yr un ffynhonnell dylent gael eu hystyried a'u datrys gyda'i gilydd a dylid creu cysylltiadau gyda strategaethau teithio llesol a strategaethau eraill ar gyfer lleihau'r defnydd o geir er mwyn lleihau llygredd neu ei gadw cyn ised â phosib, a sicrhau seinwedd briodol.
English: The pattern of proposed development should be informed by the sensitivity of, and compatibility of, uses in relation to the sources of airborne pollution and the importance of ensuring appropriate soundscapes.
Welsh: Dylai patrwm y datblygiad arfaethedig gael ei lywio gan sensitifrwydd a chydnawsedd defnyddiau mewn perthynas â ffynonellau llygredd aer a phwysigrwydd sicrhau seinweddau priodol.
English: Green infrastructure provision will be an important means of addressing the cumulative impacts of air and noise pollution and soundscapes on individuals and society and provide benefits for social and ecosystems resilience.
Welsh: Bydd darpariaeth seilwaith gwyrdd yn ffordd bwysig o fynd i'r afael ag effeithiau cynyddol llygredd aer a sŵn a seinweddau ar unigolion a chymdeithas a darparu manteision i gydnerthedd cymdeithasol ac ecosystemau
English: When proposing to introduce a development activity into an area the impacts which existing pollution sources (including roads, railways and industrial or commercial operations) have in terms of air and noise pollution should be carefully considered, particularly taking into account any increases in pollution levels which may be reasonably expected in the foreseeable future as a result of increased transport activity.
Welsh: Wrth gynnig cyflwyno gweithgarwch datblygu mewn ardal, dylid ystyried yn ofalus effeithiau ffynonellau llygredd cyfredol (gan gynnwys ffyrdd, rheilffyrdd a safleoedd diwydiannol neu fasnachol) o ran llygredd aer, a sŵn gan roi sylw arbennig i unrhyw gynnydd yn lefelau llygredd y byddai'n rhesymol eu disgwyl yn y dyfodol y gellir ei ragweld o ganlyniad i gynnydd mewn gweithgarwch trafnidiaeth.
English: In circumstances where impacts are unacceptable, for example where adequate mitigation is unlikely to be sufficient to safeguard local amenity in terms of air quality and the acoustic environment it will be appropriate to refuse permission.
Welsh: O dan amgylchiadau lle mae effeithiau'n annerbyniol, er enghraifft, lle mae lliniaru digonol yn annhebygol o fod yn ddigonol i ddiogelu amwynder lleol o ran ansawdd aer a'r amgylchedd acwstig, bydd hi'n briodol gwrthod caniatâd.
English: Location of Commercial, Industrial and other Potentially Polluting Development
Welsh: Lleoliad Datblygiad Masnachol, Diwydiannol neu Eraill allai Lygru
English: Such development should be located in areas where there is low potential for public exposure, or where its impact can be minimised.
Welsh: Dylid lleoli datblygiadau o'r fath mewn ardaloedd lle ceir ond ychydig o botensial i'r cyhoedd ddod i gysylltiad ag ef a lle y gellid cadw'r effeithiau yn fach.
English: Novel or new development types may potentially cause pollution and should be carefully considered, and where appropriate, decisions should be based on the precautionary principle.
Welsh: Gallai mathau newydd neu arloesol o ddatblygiad o bosibl achosi llygredd a dylid eu hystyried yn ofalus a lle bo'n briodol, dylai penderfyniadau fod yn seiliedig ar yr egwyddor rhagofalus.
English: Further guidance on wind turbine noise assessment can be found in ETSU-R-97
Welsh: Ceir rhagor o gyngor ar asesu sŵn tyrbinau gwynt yn ETSU-R-97
English: location, including the reasons for selecting the chosen site itself;
Welsh: lleoliad, yn cynnwys rhesymau dros ddewis y safle dan sylw;
English: impact on health and amenity;
Welsh: effaith ar iechyd ac amwynder;
English: effect of pollution on the natural and built environment and the enjoyment of areas of landscape and historic and cultural value;
Welsh: effaith llygredd ar yr amgylchedd naturiol ac adeiledig a mwynhad ardaloedd o dirwedd a gwerth hanesyddol a diwylliannol;
English: impact on groundwater and surface water quality;
Welsh: yr effaith ar ansawdd dŵr daear a dŵr wyneb;
English: effect on biodiversity and ecosystem resilience, including where there may be cumulative impacts on air or water quality which may have adverse consequences for biodiversity and ecosystem resilience;
Welsh: yr effaith ar fioamrywiaeth a chydnerthedd ecosystemau, gan gynnwys lle gallent gael effeithiau cronnus ar ansawdd aer a dŵr a allai arwain at ganlyniadau andwyol i fioamrywiaeth a chydnerthedd ecosystemau;
English: the risk and impact of potential pollution from the development, insofar as this might lead to the creation of, or worsen the situation in, an air quality management area, a noise action planning priority area or an area where there are sensitive receptors;
Welsh: risg ac effaith llygredd posibl o'r datblygiad, i'r graddau y gallai hyn arwain at greu, neu waethygu'r sefyllfa mewn ardal rheoli ansawdd aer, ardal flaenoriaeth cynllun gweithredu ar sŵn, ardal lle ceir derbynyddion sensitif;
English: impact on the road and other transport networks, and in particular on traffic generation, particularly where the proposed development is not transport infrastructure itself.
Welsh: effaith ar y ffordd a rhwydweithiau trafnidiaeth eraill, ac yn enwedig ar greu traffig, yn enwedig os nad yw'r datblygiad ei hun yn seilwaith trafnidiaeth.
English: It is the overall expectation that levels of pollution should be reduced as far as possible and for this reason the location of potentially polluting development should be taken into account as part of overall strategies in development plans to ensure it can be appropriately located and maximum environmental benefits can be gained through measures such as green infrastructure.
Welsh: Y disgwyl cyffredinol yw y dylid gostwng lefelau llygredd i'r graddau pellaf posibl ac am hynny, dylid ystyried lleoliad datblygiad allai lygru fel rhan o'r strategaethau cyffredinol mewn cynlluniau datblygu ar gyfer ei leoli'n briodol a'i fod yn esgor ar y manteision amgylcheddol mwyaf posibl trwy fesurau fel seilwaith gwyrdd.
English: Sensitive Development
Welsh: Datblygiad Sensitif
English: It will not be appropriate to locate sensitive uses, such as hospitals, schools, care homes and housing adjacent to busy roads or other transport routes, where there are no connectivity benefits to be gained and where health and amenity impacts associated with increased exposure of people to pollution will be unacceptable.
Welsh: Ni fydd hi'n briodol lleoli defnyddiau sensitif, fel ysbytai, ysgolion, cartrefi gofal a thai, y drws nesaf i ffyrdd prysur neu lwybrau trafnidiaeth eraill, lle nad oes manteision cysylltedd, neu lle byddai effeithiau iechyd ac amwynder sy'n gysylltiedig â chysylltiad cynyddol pobl â llygredd yn annerbyniol.
English: Whilst some uses may be appropriate with the aid of good design air quality and soundscape considerations can be overriding factors, especially for sensitive uses, if they cannot be adequately mitigated and impacts minimised.
Welsh: Tra gallai rhai defnyddiau fod yn briodol gyda chymorth dylunio da, gall ystyriaethau ansawdd aer a seinwedd fod yn ffactorau pwysicach, yn enwedig yn achos defnyddiau sensitif, os na ellir eu lliniaru'n ddigonol neu gadw'r effeithiau'n fach.
English: This may include employing the principles of good acoustic design and the inclusion of active travel or travel management measures as part of development proposals.
Welsh: Gallai hynny gynnwys defnyddio egwyddorion dylunio acwstig da a chynnwys teithio llesol a mesurau rheoli teithio fel rhan o'r cynigion datblygu.
English: Such development, however, should preferably be located away from existing sources of significant noise, which may include aircraft noise or roads, particularly new roads or those with programmed route improvements.
Welsh: Yn ddelfrydol, fodd bynnag, dylai datblygiad o'r fath gael ei leoli i ffwrdd o ffynonellau cyfredol o sŵn arwyddocaol, a allai gynnwys sŵn awyrennau neu ffyrdd, yn enwedig ffyrdd newydd neu'r rheini sydd â rhaglenni o welliannau.