Yn dilyn ateb Ysgrifennydd y Cabinet na fydd set lawn o ddata ansawdd aer blynyddol wedi'u dilysu ar gyfer y parth 50mya estynedig o Bort Talbot i Abertawe ar yr M4 ar gael tan fis Medi 2019 ar y cynharaf, a wnaiff gadarnhau pryd y caiff y cyfyngiadau cyflymder dros dro o 50 mya eu codi?
Last week, we published the final Welsh Government Supplemental Plan to the UK Plan for tackling roadside nitrogen dioxide concentrations. The plan contains information on the work undertaken at the 5 locations on the roads that we manage, including details and a programme for the Action Plan Measures which for the M4 at Port Talbot includes continuation of the 50mph speed limit.
As set out in the Plan, it is anticipated that that the speed limits will remain in force for as long as they are required to maintain air quality standards. Accordingly, it is not possible to confirm the duration of the limits at this stage. However, the 50mph speed limits will be reviewed periodically to determine whether they are still necessary.
The Plan also contains details of the Precautionary Retained Measures that may be required should the on-site monitoring record NO2 values higher than predicted in the DEFRA Pollution Climate Mapping (PCM) model.
The plan can be found at the following link: https://gov.wales/topics/environmentcountryside/epq/airqualitypollution/airquality/?skip=1&lang=en&