aer

Nawr, mae'n ddiddorol nodi y gall traciau trên fod 20 gradd Celsius yn boethach na thymheredd yr aer pan fydd gwres eithafol, a dim ond ar ôl iddynt gyrraedd tymheredd o 24 gradd Celsius y gallwch atgyweirio traciau trên.

Now, it's interesting to note that train tracks can be 20 degrees Celsius hotter than air temperature when there's extreme heat, and you can only repair train tracks once they reach a temperature of 24 degrees Celsius.

C1

Nid yn unig y mae gan natur hawl i ffynnu, mae hefyd yn darparu'r aer a anadlwn, y dŵr a yfwn, a'n bwyd hefyd.

Nature not only has a right to thrive, it provides us with the air we breathe, water we drink, and our food as well.

C1

Mae'r datganiad cyntaf rwyf yn gofyn amdano ar ansawdd aer.

The first statement requested is on air quality.

B2