New figures show it took an ambulance 44 minutes to arrive at a life-threatening emergency in Leitrim.
The information shows that response-time targets aren't being met in up to 50 percent of such cases across the country.
On two occasions it took an ambulance over an hour to arrive at a life-threatening emergency.
There were response-times of over an hour in Kildare and Cork.
David Hall, who runs Lifeline Ambulance, a private firm, says it's a major concern:
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