In May 2021, the proportion of all calls that were immediately life-threatening (red calls) was 7.4%, up from 6.9% in April 2021.
Ym mis Mai 2021, roedd cyfran yr holl alwadau lle mae bywyd yn y fantol (galwadau coch) yn 7.4%, i fyny o 6.9% ym mis Ebrill 2021.