There are calls for a "serious investigation" after shocking new figures have revealed more than 200 cases across Wales last year when an ambulance took over an hour to reach the most critical calls.
In one 999 case, paramedics took almost two hours to respond to a reported stabbing or shooting - and a patient with a suspected heart attack had to wait more than three hours.
The delays only came to light after the Shadow Health Minister demanded the figures under the Freedom of Information Act.
Our Health Reporter Rob Osborne has our top story.
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Drink lots of water, stay out of the sun during the middle of the day, and take particular care of vulnerable people.