Ar-lein, Mae'n arbed amser
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Llygredd Aer
Llygredd Atmosfferig ac Ansawdd Aer Ansawdd Aer Mae ansawdd aer yn dynodi pa mor iach yw’r aer yr ydym yn ei anadlu. Mae llygredd aer yn arwain at ansawdd aer gwael. Gall hyn effeithio ar iechyd dynio… Content last updated: 07 Ebrill 2026
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