Extreme heat sees huge pressure on emergency services as temperatures soar above 30C in Wales
Watch the report by Charanpreet Khaira
Some patients have had to wait hours for an ambulance as the service struggles to cope with demand across the country.
The Welsh Ambulance Service said it is under "extreme pressure" having dealt with around 2,000 daily calls to 999 over the last three days.
It said immediately life threatening 'Red' calls on Monday, which saw an extreme heat warning for large parts of Wales, were were up by almost 30% compared with a week ago.
They were also up by 175% compared with the same Monday last year.
Meanwhile, demand for water in Wales has soared with one water utility firm saying it had to distribute an additional 150 million litres of water.
Dwr Cymru Welsh Water, which normally treats and distributes 850 million litres of water a day, said its teams were significantly busier.
Imogen Brown, head of water distribution, said: "We've got no concerns around water resources itself, our reservoirs are nice and healthy after quite a lot of rain in May.
"But we usually treat around 850 million litres of water a day and distribute that around the network to our customers which is equivalent to 350 Olympic-sized swimming pools.
"But over recent days we've actually had to distribute 150 million litres more so the teams have been incredibly busy.
"This is probably due to the extreme temperatures we're seeing and also it's the beginning of the summer holidays and a lot of people are deciding to stay in Wales or come to Wales on holiday."
The Welsh Ambulance Service said the main reason for calls to 999 were breathing problems, followed by falls. Around 9% of calls were from people experiencing chest pain, with 7% from those feeling faint.
The director of operations for the service Lee Brooks said, "Yesterday’s heat coupled with the delays at hospitals meant we reached a point in the early evening where demand actually overtook our capacity.
“While we’re in a more stable position today, we’re still experiencing extreme pressures right across Wales, and we need the public’s help.“Please only call 999 if a life is on the line – that’s a cardiac arrest, chest pain or breathing difficulties, loss of consciousness, choking or catastrophic bleeding."
People are being asked use alternatives to 999 if it is not a life threatening emergency by beginning with the symptom checker on the NHS 111 Wales website, GPs, pharmacists and the Minor Injuries Unit.