He worked closely with Anglesey County Council to help them improve ventilation in schools and they introduced CO² machines to monitor air quality before any official guidelines were introduced.
Gweithiodd yn agos gyda Chyngor Sir Ynys Môn i'w helpu i wella awyru mewn ysgolion a gwnaethant gyflwyno peiriannau CO² i fonitro ansawdd aer cyn bod unrhyw ganllawiau swyddogol yn cael eu cyflwyno.