Pa asesiad y mae'r Gweinidog wedi'i wneud i ganfod a fyddai gwelliannau i gefnffyrdd a gynlluniwyd i atal traffig sefydlog yn lleihau llygredd aer ar gefnffyrdd Cymru?
Wedi'i ateb gan Y Dirprwy Weinidog Newid Hinsawdd | Wedi'i ateb ar 01/07/2022
All schemes, be they Active Travel or road, which affect the trunk road, especially the larger interventions, are subject to Environmental Assessments during their development to ensure they will reduce air pollution as one of the aims.