Os caiff y Doll Teithwyr Awyr ei datganoli i Gymru, byddai penderfyniadau Llywodraeth Cymru ar gyfraddau'r Doll yn y dyfodol yn ystyried yn llawn yr effeithiau posibl ar yr amgylchedd, gan gynnwys allyriadau carbon, er mwyn bodloni gofynion statudol Deddf Llesiant Cenedlaethau'r Dyfodol (Cymru) (2015) a Deddf yr Amgylchedd (Cymru) 2016. Caiff yr asesiad hwn ei wneud gan ystyried pa bwerau a fyddai'n cael eu datganoli a'r amgylchiadau ar yr adeg pan fyddai unrhyw benderfyniadau'n cael eu gwneud gan Lywodraeth y DU ynghylch datganoli. Byddai unrhyw newidiadau a gynigir hefyd yn destun ymgynghoriad llawn gyda busnesau a phobl Cymru.
In the event APD is devolved to Wales, the Welsh Government’s decisions on future APD rates would take account of potential environmental impacts, including carbon emissions, in order to meet statutory requirements of the Well-being of Future Generations Act (Wales) (2015) and Environment (Wales) 2016 Act. This assessment would be done in the context of which powers were being devolved and the circumstances at the time of any decision by the UK Government on devolution. Any changes proposed would also be subject to full consultation with businesses and the people of Wales.