In September, the proportion of all calls that were immediately life-threatening was 12.5%, up from 11.0% in August and the fifth highest on record.
Ym mis Medi, roedd cyfran yr holl alwadau lle’r oedd bywyd yn y fantol yn 12.5%, i fyny o 11.0% ym mis Awst, a’r ffigur uchaf ond pedwar erioed.