Bu yn aelod o Banel Cynghori ar Aer Glân Llywodraeth Cymru ers 2020, gan gadeirio is-grwpiau ar dargedau llygryddion ac effeithiau iechyd. Yn 2020, arweiniodd adroddiad y Panel ar 'Effeithiau pandemig Covid-19 ar ansawdd aer yng Nghymru'.  Mae wedi cyflwyno'r cysylltiadau rhwng ansawdd aer a iechyd ar ran Llywodraeth Cymru mewn digwyddiadau ymgynghori cyhoeddus i baratoi ar gyfer Deddf yr Amgylchedd (Ansawdd Aer a Seinweddau) (Cymru) 2024. Bu hefyd yn aelod o Banel Adolygu Annibynnol Cyfarwyddyd Ansawdd Aer Llywodraeth Cymru ers 2018 ac mae'n aelod o Grŵp Trawsbleidiol Senedd Cymru - Deddf Aer Glân i Gymru. Mae pob cyhoeddiad gan y Panel ar gael arwefan Ansawdd Aer yng Nghymru.
He has been a member of the Welsh Government Clean Air Advisory Panel since 2020, chairing sub-groups on pollutant targets and health impacts. In 2020, he led the Panel’s report into the ‘Impacts of the Covid-19 pandemic on air quality in Wales’.  He has presented the links between air quality and health on behalf of the Welsh Government at public consultation events in preparation for the Environment (Air Quality and Soundscapes) (Wales) Act 2024. He has also been a member of the Welsh Government Air Quality Direction Independent Review Panel since 2018 and sits on the Welsh Parliament Cross Party Group - A Clean Air Act for Wales. All publications by the Panel are made available on theAir Quality in Wales website.