Scientists have identified the maximum mix of heat and humidity humans can survive in.
Thus far, it was thought even a healthy young person will die after enduring six hours of 35ºC warmth when coupled with 100 per cent humidity – a critical limit known “wet bulb temperature”.
However, new research shows that the threshold could be significantly lower.
The theorised human survival limit of 35ºC wet bulb temperature represents 35ºC of dry heat as well as 100 per cent humidity – or 46ºC at 50 per cent humidity. To test this limit, researchers at Pennsylvania State University measured the core temperatures of young, healthy people inside a heat chamber.
They found that participants reached their “critical environmental limit” – when their body could not stop their core temperature from continuing to rise – at 30.6ºC wet bulb temperature, well below the previously theorised 35ºC.
The team estimated that it would take between five and seven hours before such conditions would reach “really, really dangerous core temperatures”, said Daniel Vecellio, who worked on the research.
At this point sweat – the body's main tool for bringing down its core temperature – no longer evaporates off the skin, eventually leading to heatstroke, organ failure and death.
What is wet bulb temperature?
Though now mostly calculated using heat and humidity readings, wet bulb temperature was originally measured by putting a wet cloth over a thermometer and exposing it to the air.
This allowed it to measure how quickly the water evaporated off the cloth, representing sweat off the skin.
The previous critical limit of 35ºC has only been breached about a dozen times, mostly in South Asia and the Arabian Gulf, according to Colin Raymond of Nasa's Jet Propulsion Laboratory.
None of those instances lasted more than two hours, meaning there have never been any “mass mortality events” linked to this limit of human survival, added Raymond, who led a major study on the subject.
But extreme heat does not need to be anywhere near that level to kill people, and everyone has a different threshold depending on their age, health and other social and economic factors, experts said. For example, more than 61,000 people are estimated to have died due to the heat last summer in Europe, where there is rarely enough humidity to create dangerous wet bulb temperatures.
But as global temperatures rise – last month was the hottest in recorded history – scientists warn that dangerous wet bulb events will also become more common.
The frequency of such events has at least doubled over the last 40 years, Raymond said, calling the increase a serious hazard of human-caused climate change.
Raymond's research projected that wet bulb temperatures will “regularly exceed” 35ºC at several points around the world in the coming decades if the world warms 2.5ºC above preindustrial levels.
Joy Monteiro, a researcher in India who last month published a study in Nature looking at wet bulb temperatures in South Asia, said that most deadly heatwaves in the region were well below the 35ºC wet bulb threshold.
Any such limits on human endurance are “wildly different for different people”, he said.
Children and old people among most vulnerable
“We don't live in a vacuum, especially children,” said Ayesha Kadir, a paediatrician in the UK and health adviser at Save the Children.
Small children are less able to regulate their body temperature, putting them at greater risk, she said.
Older people, who have fewer sweat glands, are the most vulnerable. Nearly 90 per cent of the heat-related deaths in Europe last summer were among people aged over 65.
People who have to work outside in soaring temperatures are also more at risk.
Whether or not people can occasionally cool their bodies down – for example, in air-conditioned spaces – is also a major factor.
Monteiro pointed out that people without access to toilets often drink less water, leading to dehydration.
“Like a lot of impacts of climate change, it is the people who are least able to insulate themselves from these extremes who will be suffering the most,” Raymond said.
His research has shown that the El Nino weather phenomena have pushed up wet bulb temperatures in the past. The first El Nino event in four years is expected to peak towards the end of this year.
Wet bulb temperatures are also closely linked to ocean surface temperatures. The world's oceans hit an all-time high temperature last month, beating the previous 2016 record, according to the European Union's climate observatory.
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UAE WARRIORS RESULTS
Featherweight
Azouz Anwar (EGY) beat Marcelo Pontes (BRA)
TKO round 2
Catchweight 90kg
Moustafa Rashid Nada (KSA) beat Imad Al Howayeck (LEB)
Split points decision
Welterweight
Gimbat Ismailov (RUS) beat Mohammed Al Khatib (JOR)
TKO round 1
Flyweight (women)
Lucie Bertaud (FRA) beat Kelig Pinson (BEL)
Unanimous points decision
Lightweight
Alexandru Chitoran (ROU) beat Regelo Enumerables Jr (PHI)
TKO round 1
Catchweight 100kg
Marc Vleiger (NED) beat Mohamed Ali (EGY)
Rear neck choke round 1
Featherweight
James Bishop (NZ) beat Mark Valerio (PHI)
TKO round 2
Welterweight
Abdelghani Saber (EGY) beat Gerson Carvalho (BRA)
TKO round 1
Middleweight
Bakhtiyar Abbasov (AZE) beat Igor Litoshik (BLR)
Unanimous points decision
Bantamweight
Fabio Mello (BRA) beat Mark Alcoba (PHI)
Unanimous points decision
Welterweight
Ahmed Labban (LEB) v Magomedsultan Magomedsultanov (RUS)
TKO round 1
Bantamweight
Trent Girdham (AUS) beat Jayson Margallo (PHI)
TKO round 3
Lightweight
Usman Nurmagomedov (RUS) beat Roman Golovinov (UKR)
TKO round 1
Middleweight
Tarek Suleiman (SYR) beat Steve Kennedy (AUS)
Submission round 2
Lightweight
Dan Moret (USA) v Anton Kuivanen (FIN)
TKO round 2
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What can you do?
Document everything immediately; including dates, times, locations and witnesses
Seek professional advice from a legal expert
You can report an incident to HR or an immediate supervisor
You can use the Ministry of Human Resources and Emiratisation’s dedicated hotline
In criminal cases, you can contact the police for additional support
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Day 1 results:
Open Men (bonus points in brackets)
New Zealand 125 (1) beat UAE 111 (3)
India 111 (4) beat Singapore 75 (0)
South Africa 66 (2) beat Sri Lanka 57 (2)
Australia 126 (4) beat Malaysia -16 (0)
Open Women
New Zealand 64 (2) beat South Africa 57 (2)
England 69 (3) beat UAE 63 (1)
Australia 124 (4) beat UAE 23 (0)
New Zealand 74 (2) beat England 55 (2)
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White hydrogen: Naturally occurring hydrogen
Chromite: Hard, metallic mineral containing iron oxide and chromium oxide
Ultramafic rocks: Dark-coloured rocks rich in magnesium or iron with very low silica content
Ophiolite: A section of the earth’s crust, which is oceanic in nature that has since been uplifted and exposed on land
Olivine: A commonly occurring magnesium iron silicate mineral that derives its name for its olive-green yellow-green colour
Our legal columnist
Name: Yousef Al Bahar
Advocate at Al Bahar & Associate Advocates and Legal Consultants, established in 1994
Education: Mr Al Bahar was born in 1979 and graduated in 2008 from the Judicial Institute. He took after his father, who was one of the first Emirati lawyers
How much of your income do you need to save?
The more you save, the sooner you can retire. Tuan Phan, a board member of SimplyFI.com, says if you save just 5 per cent of your salary, you can expect to work for another 66 years before you are able to retire without too large a drop in income.
In other words, you will not save enough to retire comfortably. If you save 15 per cent, you can forward to another 43 working years. Up that to 40 per cent of your income, and your remaining working life drops to just 22 years. (see table)
Obviously, this is only a rough guide. How much you save will depend on variables, not least your salary and how much you already have in your pension pot. But it shows what you need to do to achieve financial independence.
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Four tips to secure IoT networks
Mohammed Abukhater, vice president at FireEye in the Middle East, said:
- Keep device software up-to-date. Most come with basic operating system, so users should ensure that they always have the latest version
- Besides a strong password, use two-step authentication. There should be a second log-in step like adding a code sent to your mobile number
- Usually smart devices come with many unnecessary features. Users should lock those features that are not required or used frequently
- Always create a different guest network for visitors
Other workplace saving schemes
- The UAE government announced a retirement savings plan for private and free zone sector employees in 2023.
- Dubai’s savings retirement scheme for foreign employees working in the emirate’s government and public sector came into effect in 2022.
- National Bonds unveiled a Golden Pension Scheme in 2022 to help private-sector foreign employees with their financial planning.
- In April 2021, Hayah Insurance unveiled a workplace savings plan to help UAE employees save for their retirement.
- Lunate, an Abu Dhabi-based investment manager, has launched a fund that will allow UAE private companies to offer employees investment returns on end-of-service benefits.
Babumoshai Bandookbaaz
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INDIA SQUADS
India squad for third Test against Sri Lanka
Virat Kohli (capt), Murali Vijay, Lokesh Rahul, Shikhar Dhawan, Cheteshwar Pujara, Ajinkya Rahane, Rohit Sharma, Wriddhiman Saha, Ravichandran Ashwin, Ravindra Jadeja, Kuldeep Yadav, Mohammed Shami, Umesh Yadav, Ishant Sharma, Vijay Shankar
India squad for ODI series against Sri Lanka
Rohit Sharma (capt), Shikhar Dhawan, Ajinkya Rahane, Shreyas Iyer, Manish Pandey, Kedar Jadhav, Dinesh Karthik, Mahendra Singh Dhoni, Hardik Pandya, Axar Patel, Kuldeep Yadav, Yuzvendra Chahal, Jasprit Bumrah, Bhuvneshwar Kumar, Siddarth Kaul
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