Fel rhan o'r gweithdy, cafodd disgyblion eu herio i ddylunio arwydd ffordd i annog gyrwyr i arafu er mwyn lleihau llygredd nitrogen deuocsid a helpu i wneud yr aer y maent yn ei anadlu'n lanach.
As part of the workshop, pupils were challenged to design a road sign to encourage drivers to slow down in order to reduce nitrogen dioxide pollution and help make the air they breathe cleaner.