Source: Welsh Ambulance Services NHS Trust (WAST) (Emergency ambulance calls and responses to red calls, by local health board and month on StatsWales)
Ffynhonnell: Ymddiriedolaeth GIG Gwasanaethau Ambiwlans Cymru (Ymatebion brys: perfformiad fesul munud i alwadau coch, fesul bwrdd iechyd lleol a mis ar StatsCymru)