Pa asesiad mae Llywodraeth Cymru wedi'i wneud o'r effaith mae cau Pont Menai wedi ei chael ar ansawdd aer ar Ynys Môn?
Wedi'i ateb gan Y Dirprwy Weinidog Newid Hinsawdd | Wedi'i ateb ar 14/02/2023
I will write to you as soon as possible with a substantive response and a copy of the letter will be published on the internet.