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Welsh: Rheoliadau Sylweddau Peryglus ac Atmosfferau Ffrwydrol 2002
English: atmospheric carbon
Welsh: carbon atmosfferig
English: Atmospheric N-fixing plant
Welsh: Planhigion sy’n bachu Nitrogen o’r atmosffer
English: normal atmospheric pressure
Welsh: gwasgedd atmosfferig arferol
Welsh: Rhestr Allyriadau Atmosfferig Genedlaethol