Translate the text from English to Welsh.



 
The measures are aimed at reducing levels of nitrogen dioxide where emissions have been found to exceed legal limits.   
  
Poor air quality contributes to an estimated 2,000 deaths per year in Wales, with exposure affecting vulnerable population groups in particular. Gases such as nitrogen dioxide can increase the symptoms of people with lung diseases, while short\-term exposure is associated with increased cardiovascular and respiratory morbidity.   
  
The temporary 50 mph speed limits will be introduced at short stretches of road, between 1\.4km to 5\.9km in length, at the following five locations:  



> • A494 at Deeside  
> • A483 at Wrexham  
> • M4 between Junctions 41 \& 42 (Port Talbot)  
> • M4 between junctions 25 \& 26 (Newport)  
> • A470 between Upper Boat \& Pontypridd

Other measures include increased signage to promote smooth traffic flow. The measures are expected to deliver immediate improvements to air quality, with emissions estimated to potentially reduce by up to 18% at the five locations.   
  
Evidence shows that nitrogen dioxide emissions are at their lowest when light vehicles, the main contributors to emissions, travel at speeds between 40 and 50 mph. The speed limits are also expected to have a smoothing effect, with vehicles travelling at more constant speeds.    
  
The temporary speed restrictions are part of a range of actions being introduced by the Welsh Government to improve air quality in Wales, including a new £20m Air Quality Fund, a Clean Air Zone Framework and a new Air Quality website providing local data on air pollution levels.   
  
Minister for Environment Hannah Blythyn said:   



> “I am committed to taking action to reduce air pollution in Wales to support a healthier future for our communities and protect our natural environment. Current levels of nitrogen dioxide exceed the legal limit at the five road locations, so we need to act as soon as possible.


> “We have been carrying out investigations into all potential measures for reducing nitrogen dioxide levels. Our initial studies tell us that 50 mph speed limits should have the greatest potential to improve air quality at each location. The actions we take to improve air quality in Wales have a key role in supporting the right conditions for better health and well\-being.”

Cabinet Secretary for Economy and Transport, Ken Skates, said:


> “I want to see concrete measures put in place by the UK Government which focus on removing the source of the problem.  They have prevented us from taking our preferred course of action – it is now time for them to step up and use the powers which they have so closely guarded for the benefit of the people of Wales.”


> “The root cause is the emissions from vehicles, but legislative competence for vehicle standards and fiscal measures, such as the Vehicle Excise Duty and Company Car Tax, remain with the UK Government. Despite repeated calls, the UK Government has consistently refused to devolve powers which allow us to improve standards and incentivise improved emissions through the tax regime.”

A consultation is open until 19 June on plans to reduce concentrations of nitrogen dioxide, as part of the wider UK plan to tackle roadside NO2 concentrations.  







Translation:


 
Nod y mesurau yw lleihau lefelau nitrogen deuocsid lle gwelwyd bod allyriadau'n mynd y tu hwnt i derfynau cyfreithlon.   
  
Mae ansawdd aer gwael yn cyfrannu at oddeutu 2,000 o farwolaethau yng Nghymru bob blwyddyn, ac mae'n effeithio'n arbennig ar grwpiau agored i niwed. Gall nwyon fel nitrogen deuocsid waethygu symptomau pobl sydd â chlefydau ar eu hysgyfaint, ac mae pobl sy'n eu hanadlu i mewn am gyfnod byr yn fwy tebygol o ddioddef o glefydau cardiofasgwlaidd ac wynebu morbidrwydd anadlol.   
  
Caiff y terfynau cyflymder dros dro o 50 milltir yr awr eu cyflwyno ar ddarnau bach o ffyrdd, sef rhwng 1\.4km a 5\.9km, yn y pum lleoliad canlynol:  
  

> • yr A494 yng Nglannau Dyfrdwy  
> • yr A483 yn Wrecsam  
>  • yr M4 rhwng Cyffordd 41 a 42 (Port Talbot)  
> • yr M4 rhwng Cyffordd 25 a 26 (Casnewydd)  
> • yr A470 rhwng Glan\-bad a Phontypridd

  
Bydd y mesurau eraill yn cynnwys gosod rhagor o arwyddion er mwyn esmwytho llif y traffig. Mae disgwyl i'r mesurau wella ansawdd aer ar unwaith, a gallai'r allyriadau fod 18% yn is yn y pum lleoliad.   
  
Mae'r dystiolaeth yn dangos bod allyriadau nitrogen deuocsid ar eu hisaf pan fydd cerbydau ysgafn, sef y rhai sy'n cyfrannu fwyaf at yr allyriadau, yn teithio ar gyflymder o rhwng 40 a 50 milltir yr awr. Mae disgwyl i'r terfynau cyflymder hefyd esmwytho llif y traffig wrth i gerbydau deithio ar gyflymder mwy cyson.   
  
Mae'r cyfyngiadau cyflymder dros dro yn rhan o gyfres o gamau gweithredu sy'n cael eu cyflwyno gan Lywodraeth Cymru er mwyn gwella ansawdd aer yng Nghymru. Maent yn cynnwys Cronfa Ansawdd Aer newydd gwerth £20 miliwn, Fframwaith Parth Aer Glân ynghyd â gwefan newydd Ansawdd Aer sy'n cynnwys data lleol ynghylch lefelau llygredd aer.   
  
Dywedodd y Gweinidog dros yr Amgylchedd, Hannah Blythyn:   
  

> "Rwy' wedi ymrwymo i geisio lleihau llygredd aer yng Nghymru er mwyn creu dyfodol mwy iach i'n cymunedau a gwarchod ein hamgylchedd naturiol. Mae lefelau presennol y nitrogen deuocsid yn mynd y tu hwnt i'r terfyn cyfreithlon yn y pum lleoliad felly mae angen i ni gymryd camau cyn gynted â phosibl.

  

> "Rydym wedi ymchwilio i'r holl fesurau posibl ar gyfer lleihau lefelau nitrogen deuocsid. Mae'n hastudiaethau cychwynnol yn dangos mai terfynau cyflymder 50 milltir yr awr ddylai fod fwyaf effeithiol i wella'r ansawdd aer ymhob lleoliad. Gall y camau rydym yn eu cymryd i wella ansawdd aer yng Nghymru ein helpu i sicrhau'r amodau cywir ar gyfer gwell iechyd a llesiant."

  
Dywedodd Ysgrifennydd y Cabinet dros yr Economi a Thrafnidiaeth, Ken Skates:   
  

> “Rwy am weld Llywodraeth y DU yn cymryd mesurau pendant sy’n mynd i’r afael â gwreiddyn y broblem.  Mae hi wedi’n rhwystro ni rhag dilyn y trywydd roeddem am ei ddilyn ac mae’n bryd iddi hi nawr dorchi llewys a defnyddio er lles pobl Cymru y pwerau mae wedi’u gochel mor hir.”

  

> “Gwreiddyn y broblem yw allyriadau cerbydau, ond Llywodraeth y DU sy’n gyfrifol am safonau cerbydau a mesurau cyllidol fel y Doll ar Gerbydau a’r Dreth ar Geir Cwmni.  Er inni erfyn dro ar ôl tro, mae Llywodraeth y DU wedi gwrthod datganoli’r pwerau a fyddai’n caniatáu inni wella’r safonau a defnyddio trethi i wella allyriadau.”

  
Bydd ymgynghoriad ar gynlluniau i leihau crynodiadau o nitrogen deuocsid, fel rhan o gynllun ehangach y DU i fynd i'r afael â chrynodiadau NO2 wrth ymyl y ffordd, yn parhau hyd 19 Mehefin.