The Welsh Government has used this published data to assign a concentration of NO2, PM2.5 and PM10 to each residential dwelling in Wales based on which square kilometre of Wales it sits in.
Mae Llywodraeth Cymru wedi defnyddio’r data cyhoeddedig hwn i neilltuo crynodiad o NO2, PM2.5 a PM10 i bob annedd breswyl yng Nghymru ar sail y cilometr sgwâr o Gymru y mae wedi ei leoli ynddo.