“Unprecedented” summer pressure has been blamed for the Welsh Ambulance Service failing to hit its emergency response time target.
The service was called more than 35,800 times in July, with over 14,300 category A life-threatening calls.
Latest figures show that 64.1% of responses to category A call-outs arrived within eight minutes, just below a 65% target.
The Welsh government said the pressure had put a strain on services and staff.
Earlier this month, the ambulance service warned about “inappropriate” 999 calls, ranging from men with hangovers to a woman bitten on her finger by a hamster.