Y cynllun gweithredu sŵn a seinwedd yw prif ddogfen bolisi Llywodraeth Cymru, a chydweithiodd awdurdodau lleol a chyrff cyhoeddus eraill i’w lunio. Mae’n amlinellu polisi strategol y sector cyhoeddus yng Nghymru mewn perthynas â rheoli sŵn a seinwedd yn ystod y pum mlynedd nesaf. Mae’n ymwneud â mwy na lleihau sŵn yn unig. Mae’n cydnabod hefyd fod angen inni greu seinweddau priodol. Hynny yw, yr amgylchedd acwstig iawn yn y man iawn ar yr adeg iawn. Mae Cymdeithas Lleihau Sŵn y DU wedi canmol Llywodraeth Cymru am fod y llywodraeth genedlaethol gyntaf i gynnwys gofynion cynllun acwstig da a rheoli seinwedd yn benodol o fewn ei bolisi sŵn.
The noise and soundscape action plan is the Welsh Government’s central noise policy document, and has been produced collaboratively with local authorities and other public bodies. It outlines the Welsh public sector’s strategic policy direction in relation to noise and soundscape management for the next 5 years. It has a broader focus than simply clamping down on the decibels, recognising that we also need to create appropriate soundscapes, meaning the right acoustic environment in the right time and place. The UK’s Noise Abatement Society has praised the Welsh Government for being the first national government to explicitly embed the requirements of good acoustic design and soundscape management in its noise policy.