Five ambulance trusts across England, including Yorkshire, failed to meet crucial response time targets, new figures suggest.
Ambulance crews across the country did not arrive on scene within eight minutes for 26% of patients who needed urgent emergency assistance last year, data suggests.
Crews are supposed to respond to 75% of "Red 1" emergency calls - the most critical calls which cover patients who have stopped breathing and do not have a pulse - within eight minutes.
But between 2012 and 2013, just 74% of patients were reached in the time frame,figures from the Health and Social Care Information Centre (HSCIC) show.
Crews in Yorkshire, the North West, the East Midlands, the East of England and the South West did not achieve the goal, according to the HSCIC.