You can still breathe at high altitudes, but the air gets thinner, making it harder to get enough oxygen; most people need supplemental oxygen above 8,000 feet (2,400m) and it becomes extremely difficult above 18,000 feet (5,500m), known as the "Death Zone" where unacclimated humans struggle to survive without oxygen due to hypoxia (oxygen deprivation).
It refers to altitudes above a certain point where the amount of oxygen is insufficient to sustain human life for an extended time span. This point is generally tagged as 8,000 m (26,000 ft, less than 356 millibars of atmospheric pressure).
Above about 8,000 meters (26,000 feet), the human body cannot survive at all, and starts to shut down. Mountaineers call this altitude the "death zone." To prevent severe altitude sickness, mountaineers bring supplemental (extra) supplies of oxygen and limit their time in the "death zone."
On Earth, the limit is around 18–19 km (11–12 mi; 59,000–62,000 ft) above sea level, above which atmospheric air pressure drops below 0.0618 atm (6.26 kPa; 47.0 mmHg; 0.908 psi).
Humans can survive up to about 20,000 ft (3.8 miles) above sea level. Above about 20,000 ft, the human body begins to suffer a condition called hypoxia in which the brain does not receive sufficient oxygen for long-term survival. The problem is that above 20,000 ft the air density is too low.
At 30,000, most humans will start experiencing disorientation and confusion within 1 to 2 minutes, called the time of “useful consciousness”. This is when a pilot or passenger must put on an oxygen mask to retain their functional thinking ability.
Camp 4 is at an altitude of around 8000m and is called the Death Zone because the human body cannot survive there for long. The oxygen level is one-third compared to the sea level. That means each breath only delivers about 30% of the oxygen our body needs.
Compared to those of us who live at sea level, the 2 million people worldwide who live above 4,500 meters (or 14,764 feet) of elevation—about the height of Mount Rainier, Mount Whitney, and many Colorado and Alaska peaks—have lower rates of metabolic diseases such as diabetes, coronary artery disease, ...
In mountaineering, the death zone refers to altitudes above a certain point where the pressure of oxygen is insufficient to sustain human life for an extended time span. This point is generally tagged as 8,000 m (26,000 ft, less than 356 millibars of atmospheric pressure).
How It Works: Pilots don't breathe pure oxygen at all times—instead, aircraft oxygen systems deliver a controlled mix. At high altitudes, pressurized cabins reduce the need, but emergency systems provide near-100% oxygen if cabin pressure is lost.
Summary. Aging is influenced by a complex interplay of multifarious factors, including an individual's genetics, environment, and lifestyle. Notably, high altitude may impact aging and age-related diseases through exposures such as hypoxia and ultraviolet radiation.
The lowest tolerable pressure of air is about 0.47 atm (475 millibars of atmospheric pressure) - recorded at 5950m altitude. At about 0.35 atm (less than 356 millibars at around 8000m) life is impossible. Pulmonary and cerebral edema lead to death.
La Rinconada is located in the Janca region, according to the classification of Pulgar Vidal. According to the May 2003 issue of National Geographic magazine, La Rinconada is 5,100 meters above sea level, thus making it the highest-elevated permanent settlement in the world.
At altitude, the reduced oxygen content of the blood induces breathing instability, with periods of deep and rapid breathing alternating with central apnea.
The death zone refers to the section of the mountain above 8,000 meters. In this zone, oxygen pressure is extremely low, and humans are unable to stay for long without having a supply of oxygen. Experts don't recommend anyone stay in the death zone for more than 16 to 20 hours.
Therefore, it makes sense that because humans and animals are adapted to breathing 21% oxygen in air, anything much different from 21% would be hazardous to our health.
The "2 PM Rule" on Mount Everest is a critical safety guideline requiring climbers to turn back from the summit by 2:00 PM, regardless of their progress, to avoid descending in darkness and severe weather in the dangerous "Death Zone". This rule, emphasized by tragedies like the 1996 disaster, acknowledges that the descent is often more perilous, requiring daylight, sufficient energy, and oxygen to return safely to lower camps before nightfall and sudden storms set in.
Francys Arsentiev (January 18, 1958 – May 24, 1998) was the first American woman to reach the summit of Mount Everest without using bottled oxygen, on May 22, 1998. Both she and her husband, Sergei Arsentiev, died during the descent. Her body was visible to climbers until 2007, when it was moved from view.
Renshaw posits that when coming to altitude, people experience an increase in dopamine and a decrease in serotonin. What's interesting is that some people feel better at altitude, while others suffer from the depressive like symptoms.
These 6 Animals Live at the Highest Altitudes on the Planet
Climbing Mount Everest costs around $40,000 (or more) due to massive logistical needs, including mandatory permits, crucial Sherpa support, essential supplemental oxygen, high-quality gear, insurance, and extensive base camp services, all spread across a six-week expedition with significant overhead for safety and support in extreme conditions. The price reflects a combination of government fees, specialized staff, complex transport, and critical life-support systems for the deadly "death zone".
Last month, as the 2025 climbing season began on Mount Everest, Nepal's upper house of Parliament introduced a tourism bill that includes a suite of new rules that would significantly raise the bar for who is allowed to attempt the mountain, who can guide, and how much it will cost.
Edmund Hillary and Tenzing Norgay used supplemental oxygen to summit Mount Everest. The area above 8,000 meters (26,250 feet) on Everest is called the “Death Zone.” This is because the air is thinner, meaning that the concentration of oxygen is lower.