How to cleanse your lungs with simple, natural ways
- Nature Source Chaude
- Published on
- Updated on 2 April 2025
Like many other organs, the lungs are essential for maintaining the health of the rest of the body. The lungs undergo continuous repair processes that can be optimised according to lifestyle, helping to limit a state of progressive degeneration that is multifactorial (age, pollution, stress, lifestyle…). When exposure to pollutants ceases, the lungs can regenerate more easily and more quickly.
In this article, we discuss natural, mainly lifestyle-related methods that can be useful in helping to clean and detoxify your lungs.
IN SUMMARY :
Open the windows
Air quality is an important factor in lung health. We all know that smoking is bad for our health. In this case, the most effective thing to do is to quit smoking and avoid passive smoking by moving away from noticeable toxic fumes.
On the other hand, the damage caused by outdoor and indoor air pollution is so imperceptible that it is difficult to become aware of it. Although the effects are very real, they don’t usually cause any real discomfort, so we are under the illusion that everything is fine. However, the presence of many harmful pollutants in the air, especially in cities, intoxicates us a little more every day and can lead to health problems over a longer or shorter period of time.
Indoor air pollution
Indoor air pollution is 5 to 10 times higher than outdoor air pollution, even though we spend most of our time (over 80%) indoors.
It contains all kinds of chemical pollutants, but also a completely natural gas, carbon dioxide (CO2), which can be particularly toxic as its concentration in the air increases. That’s what we’ll look at next.
This pollution comes from a number of sources: from the occupants (in particular), from the heating appliances and from the water heater. What’s more, these appliances can also release carbon monoxide, a toxic gas. Carbon monoxide is produced when the oxygen supply to the burner is reduced.
The problem of excess carbon dioxide in the indoor environment
Before we understand the problem, let’s look at the composition of the air we breathe. Ambient air is a mixture of gases containing 78% nitrogen, 21% oxygen, 0.043% carbon dioxide (or 430 ppm) and 1% other gases.
Breathing allows our body to deliver oxygen to the cells and to expel gaseous waste, carbon dioxide, to the outside. This exhaled air is made up of a mixture of gases containing 78% nitrogen, 15% oxygen, 5.5% carbon dioxide and 1% other gases. The inhaled air then needs to be replaced to make the gas exchange as efficient as possible. This is not a problem in nature, where air is constantly renewed. A breath of fresh air contains 430 ppm of CO2.
But in a closed, poorly ventilated environment, the air is not renewed as it is outside. The result is an increase in the concentration of CO2 in the air. I’ve personally noticed that it only takes a few hours for the concentration of C02 in a small apartment to rise from 430 ppm to 1500 ppm.
What’s more, carbon dioxide is a gas 1.5 times heavier than air. In an closed environment where the air is stagnant, CO2 accumulates near the floor and displaces oxygen. As a result, indoor air becomes oxygen-deficient. The mechanisms for poisoning us by inhaling our own carbon dioxide can then unfold.
The toxicity of carbon dioxide
This toxicity depends, of course, on an individual’s tolerance to C02, which varies greatly, and on the level of exposure. As well as being toxic (when its concentration in the air exceeds 430 ppm), it causes asphyxia through hypoxia (lack of oxygen). Energy levels drop, the breathing rate (between inhaling and exhaling) slows down and so does the rate of biochemical reactions that take place in the lungs and throughout the body. Vein membranes dilate and lose their elasticity.
The first symptoms, such as headaches, difficulty concentrating, sleep problems, skin or eye irritation, may appear without anyone making the connection.
The concentration of carbon dioxide in the air is extremely important, as this gas is also one of the most important factors in regulating intracellular and extracellular pH[2]. It therefore plays a vital role in one of the most important functions of homeostasis. Furthermore, according to the same study, impaired homeostasis is associated with many mental disorders.
Consequences for the lung microbiota
Like the gut microbiota, the lung microbiota is important for your health. The microorganisms (bacteria, fungi, archaea, viruses, etc.) present in the airways are balanced by a number of factors[3], including the air we breathe.
After a certain degree of hypoxaemia and CO2 intoxication, the diversity of microorganisms and the abundance of certain species normally found in the respiratory tract can be affected. The proliferation of certain bacterial species, leading to a reduction in species richness, is associated with several lung diseases.
According to one study[4], the role of the lung microbiota is closely linked to the regulation of immunity, lung homeostasis and disease. Another study[5] shows that polluted air also directly disturbs the gut microbiota and has a negative impact on its species diversity, which favours the occurrence of other diseases (diabetes, dysbiosis, intestinal disorders, etc.). Intestinal dysbiosis can therefore be a direct consequence of pulmonary dysbiosis.
Monitoring the level of carbon dioxide in the air
A window that is opened regularly or slightly, even in winter, is the best way to improve the quality of your living environment.
In this way, polluted air (from household pollutants) which is exhausting for the body is replaced by invigorating air (unfiltered and from outside) which is less polluted.
As we’ll see, it also reduces humidity, which can be a problem.
Measuring C02 levels in the air is considered the best indicator of air quality.
It’s important to be aware of this because air is the main food we eat: an adult breathes in an average of 12,000 litres of air every day.
Beware of micro-organisms and humidity!
Microorganisms are found in all environments: soil, water and air, where they are very diverse. Their distribution in the air is a sensitive indicator of environmental quality.
So when we breathe in all kinds of pollutants, we also breathe in the microorganisms that attach themselves to them.
Their diversity and abundance correlate with a number of factors, including the presence of non-biological particles in the air. In general, the more urbanised the environment (no natural soil), the more abundant and similar the micro-organisms found in the air.
What’s more, these particles (such as dust, volatile organic compounds (VOCs) or heavy metals) are found in every home.
Bacteria are constantly interacting with these particles of different sizes, which can act as a source of energy (degradation), as a shelter and as a means of transport. The finer the particles inhaled, the deeper they penetrate the respiratory tract. These airborne bacteria can be pathogenic, dead or alive, and can cause significant adverse effects in the respiratory tract, such as asthma or allergies[6].
According to a large number of studies[7][8], the interaction between these particles and bacteria poses a real threat to respiratory health.
The higher the concentration of particles in the air, the more nutrients are available to the bacteria, which then proliferate.
Their growth also depends on a number of other factors such as the rate of air renewal, air movement, light, temperature and humidity.
Humidity is a critical factor as it greatly favours the development of micro-organisms such as house dust mites and fungi, which are responsible for allergies and inflammation of the respiratory tract. Water is essential for spores to germinate and fungi to grow. A relative humidity of over 70% is ideal for the growth of house dust mites, but they can also grow and survive at 50% humidity.
Human activity (cooking, bathing) is obviously a major source of humidity. However, the mere presence of people is enough to increase humidity.
Good ventilation is therefore essential to remove moisture and limit the proliferation of micro-organisms and dust mites.
Practising physical activity in more natural conditions
Exercise is an important lifestyle factor that can have a positive effect on cleansing and supporting the respiratory tract. However, this is only beneficial if the body has been soothed by rest. After a hard day’s work, vigorous exercise is less beneficial. You should try to spread out your exercise as evenly as possible, otherwise you run the risk of fatigue and exhaustion. Physical exertion during the day is synonymous with good fatigue, better sleep and recovery.
Aerobic exercise is preferred to improve breathing capacity and support lung function. Regular walking at a moderate intensity is particularly suitable and can :
- help to thin the lungs and reduce lung congestion in people with poor breathing.
- Give exhausted organs more energy to fight certain microbes that stick to them and multiply
- Strengthen the immune system, improve blood circulation and stimulate the production of white blood cells.
Finally, the pulmonary microbiota is subject to continuous renewal[9], which can have a major impact on respiratory disease. Exposure to microorganisms and microbial compounds in more natural living conditions (natural soil, abundant vegetation) can be beneficial for the pulmonary microbiota and strengthen the immune system.
Walking, for example, is one of the best ways to get close to nature.
To learn more about walking, I invite you to read this article: Should you Walk or Run for your Health ?
Exposure to natural light
The quality and quantity of light is important to support all light-dependent bodily functions.
Sunlight is part of our daily diet and, like air, is the most important nutrient for the body. In the absence of natural light, the body absorbs what it is given, which is artificial light. The detoxifying capacity of the body’s organs (liver, lungs, etc.) varies according to the lighting conditions.
Being outdoors as much as possible allows you to benefit from the best quality of light. Indoors, full spectrum lighting (close to the sun in terms of ‘colour rendering’) has been shown to reduce stress and improve behaviour (hyperactivity, irritability, fatigue, lack of attention) compared to other types of lighting (e.g. white fluorescent lamps). However, the sun’s electromagnetic spectrum also varies (in intensity) throughout the day. Some commercially available light bulbs can reproduce these variations in the light spectrum. In reality, our bodies are closely synchronised with the environment (natural light) and adjust their physiological responses according to the signals received.
What’s more, the intensity of light (the amount of rays received) outdoors can be up to 100 times greater than that emitted indoors by artificial lighting, and is therefore difficult to reproduce. This intensity varies and increases in the morning until it reaches a peak : solar noon. If we don’t expose ourselves to light during the day, we are more likely to develop nutritional deficiencies.
Finally, light is often associated with vitamin D. This vitamin (which acts like a hormone) strengthens the defence mechanisms [10] of the respiratory tract and modulates inflammatory responses. It has a protective role against infections [11] that damage the lung epithelium and increase mucus production.
When sleep comes...
As daily and seasonal biological rhythms are a vital reality, it’s important to consider the time of sunset. This marks the end of the day and the beginning of a long period of sleep at night, which promotes physical and mental recovery.
The further we move away from this framework, the less restorative our sleep will be. In the past, sunlight determined the rhythm of the day for activities, mealtimes and even sleep times.
Ultimately, nothing solid or lasting can be achieved if sleep is not a priority in the quest for true health.
In the sanatorium era, a period rich in lessons
History tells us that at the end of the 19th century, tuberculosis was the main cause of death in France. The various forms of this infectious disease, linked to a mycobacterium (Koch’s bacillus), most commonly affected the lungs.
This led to the construction of the first centres for the treatment of patients suffering from pulmonary tuberculosis. Then, at the beginning of the 20th century, a large number of centres specialising in the treatment of tuberculosis, known as sanatoria , were built. From 1943, with the advent of streptomycin (an antibiotic), they were forced to close one by one. But what was sanatorium practice like before it disappeared?
The sanatoria were set in unspoilt countryside with lush vegetation. Large parks allowed patients to breathe pure, invigorating air. Air cures, rest and the search for light and sunshine were at the heart of the treatment.
The air cure consisted of leaving the windows open or ajar all night after a long day during which the patient had already been in contact with the outside air. This practice was the basis of the cure. The aim was to make the body and respiratory tract as strong as possible so that it could fight off infection on its own.
What’s more, the furnishings were rudimentary to make cleaning easier, and the comfort was very basic. Particular attention was paid to the bed itself. The iron or wooden base, which could sometimes be dismantled, had to be as simple as possible to make it easy to clean. The mattress, stuffed with wool, kapok, plant or animal hair (horsehair for example) and covered with canvas, was regularly cleaned in the oven or exposed to the sun. For ease of handling, the mattress could be divided into several parts. Blankets, linen and chair mattresses were also periodically disinfected.
To withstand the winter cold, each patient was equipped with warm clothes, woollen blankets and fur bags so that they could follow the air cure without difficulty.
Sleeping in a healthy environment
History shows that even then, mattress washing and disinfection were taken very seriously in the case of the most serious respiratory diseases. Especially as we spend more than 8 hours a day on a mattress, that accumulates dead skin (100 mg/day), hair, sweat, food waste, etc., a breeding ground for dust mites, bacteria and fungi. What’s more, more than 1 litre of water is lost each night through perspiration and breathing, increasing their activity.
Nowadays, almost everything in the home can be washed or disinfected, except the mattress that makes us sick. According to a report[12] by bedding brand Amerisleep, new mattresses contain more than 3 million bacteria, 17442 times more than toilet seats. But that’s not all, because the bed linen used also contains an alarming number of bacteria in just 7 days. And the more days that pass, the more they multiply. What’s more, our mattresses release a lot of volatile organic compounds (VOCs) while we sleep. These are harmful to the respiratory tract and irritate the eyes and skin.
The presence of certain microorganisms, as well as house dust mites, is thought to promote the development of respiratory diseases such as asthma, which affects more than 300 million people worldwide. However, numerous studies on asthma have generally shown that the more people maintain a traditional lifestyle away from urban environments, the lower the prevalence of asthma. However, the introduction of chemically treated blankets and mattresses (⚠️ natural organic fibres are also chemically treated) has provided a new environment for the growth and multiplication of Dermatophagoides mites (D. Farinae and D. Pteronyssinus) and micro-organisms, all the more so if they (blankets, mattresses) are not washed regularly.
According to a study[13] published in 1985, the prevalence of asthma had been increasing for about ten years (1975-1985), despite a traditional lifestyle, in village communities in Papua New Guinea (tropical climate => high humidity).
Papuans lived in thatched huts and slept on woven rattan platforms wrapped in a simple cotton blanket. These cheap cotton blankets were widely available to the general population at the time. The study found that dust collected from the blankets contained mite densities 40 to 50 times higher than dust collected from the ground at various locations.
Moving to the mountains ?
To introduce this section, let’s continue with the history of sanatoriums. In the 1920s, part of the medical profession came to believe in altitude as a means of combating tuberculosis. It must be said that the length of stay could vary from a few weeks to several years, depending on the type of tuberculosis. The altitude sanatorium produced more convincing and faster results than the lowland sanatorium.
Today, asthma is a difficult disease to cure. It’s true that a healthy lifestyle (diet, calorie restriction, physical exercise, etc.) can help limit the symptoms , but taking into account your environment and lifestyle, or simply going to live in the mountains, can make a huge difference.
The advantages of altitude
Staying at altitude can therefore be more beneficial for respiratory illnesses.
The main advantage of altitude is that the higher you go, the lower the oxygen pressure in the surrounding air. This means that for every breath you take, there are fewer oxygen molecules to pass through your lungs and into your bloodstream. This lack of oxygen (hypoxia) forces the body to use physiological mechanisms to compensate for the lack of oxygen. This has a number of beneficial effects on the body.
Another benefit of altitude is that the often lower humidity and temperatures limit the presence and growth of dust mites and mould in the home.
Are the mountains a good place for people to go with respiratory problems ?
In the mountains, pollutants are always present, but in lower concentrations. The atmosphere is also constantly ventilated and light intensity is higher.
With increasing altitude, the air becomes drier and the number of negative ions per cm³ increases.
A moderate altitude between 1,000 and 1,800 metres therefore has many advantages for the quality of the ambient and indoor air.
Bed mites, which are partly responsible for respiratory diseases, can be absent from homes even when their food is present. For example, they disappear completely at an altitude of 1300 metres in the Hautes-Alpes (France) and 1500 metres in the Pyrenees. It’s not for nothing that the Hautes-Alpes and Alpes-de-Haute-Provence are two of the most popular departments (France) for allergy sufferers.
What’s more, when you return to the lowlands, your body will benefit from an improved ability to transport oxygen. Depending on the length of your stay, this effect can last from a few weeks to a few months.
However, despite the many benefits of high altitude, it is important to get fresh air into the bedroom as often as possible, even in the mountains, which is not always easy in winter.
What about inhaling thermal bath vapours?
Thermal water can significantly improve conditions such as asthma, COPD, bronchiectasis and other lung diseases. The inhalation of thermal vapours[14] and gases can reach damaged tissue directly, making it one of the most effective therapies for respiratory diseases.
The mechanical action of the thermal water drains away stagnant secretions and excess mucus.
Hydrogen sulfide, a powerful thermal gas
Sulphur, in the form of hydrogen sulphide (rotten egg smell), is a powerful thermal gas that reduces the viscosity of secretions thanks to its mucolytic action. Its bactericidal properties explain its importance in infectious pathologies, particularly in the respiratory tract. A study[15] also highlights its immunomodulating activity.
In addition, sulphurous water is beneficial for a wide range of disorders because the gas (H2S) is a signalling molecule (gives precise information) that targets a large number of important biological processes and pathways[16]. It is certainly one of the most potent forms of sulphur needed by the body to restore health.
A meta-analysis[17] published in 2019 looked at hydrogen sulphide and its many biological effects on lung cells and the immune system. Hydrogen sulphide is said to be mucolytic, antioxidant, anti-inflammatory, antiviral, antibacterial, analgesic and anticancer.
Hydrogen sulphide acts on nerve endings through its analgesic action, Hydrogen sulphide acts on nerve endings through its analgesic action, relieving pain and irritation in the mucous membranes of the respiratory tract. It also plays an important fibrinolytic role (dissolves fibrin and thrombi) in respiratory diseases.
According to one study[18], hydrogen sulphide intake would increase the ratio of reduced to oxidised glutathione in the cell, thereby protecting the airways from oxidative stress. This ratio is an important indicator of cellular health, as glutathione is one of the most important antioxidants. It also detoxifies a wide range of heavy metals and pollutants.
Other gases that are good for the airways
Thermal waters containing bicarbonate also have interesting properties when inhaled. These bicarbonate ions come from the carbon dioxide that has been dissolved in the water. They can be useful in relieving certain respiratory problems.
These thermal waters can also release hydrogen (H2), a natural gas. Hydrogen is known to be a very powerful antioxidant. According to a meta-analysis[19] (a summary of several studies) published in 2022, molecular hydrogen has beneficial effects (anti-inflammatory, antioxidant, regulation of autophagy, anti-ageing, etc.) on all organs. The very broad therapeutic spectrum of hydrogen in pulmonary diseases is described. This gas may be accompanied by methane.
The presence of methane, a natural gas, is linked to methanogenesis. Specific (chemolithotrophic) bacteria produce methane thanks to the presence of hydrogen and CO2, whose origin is deep underground. Another meta-analysis[20] published in 2020 describes the beneficial effects (antioxidant, anti-inflammatory, etc.) of methane (CH4) on various diseases. Yet methane is often associated with disease. However, according to the meta-analysis, numerous studies have shown the opposite. Methane may indeed have a protective effect, but the mechanism remains poorly understood. There is also considerable evidence [21][22] that an exogenous supply of methane (CH4) or molecular hydrogen (H2) has a beneficial effect on mitochondria (the heart of cells).
Hot water springs can also provide helium (He), a natural gas found in the atmosphere (its concentration in the air is 5 ppm). A meta-analysis[23] published in 2013 describes the role of helium in medicine and its efficacy in various respiratory, cardiovascular and neurological diseases. Again, other studies are more mixed as the mechanisms of action are poorly understood. For a long time it was even thought to be biologically inert, but this is not the case.
What's the best way to inhale gases ?
When thermal water gushes out of the ground, the release of vapours and gases is significant and diminishes as it flows along its path.
These thermal vapours must be inhaled directly into the hot water pool, even if it is a long way from the point of emergence. Why should you do this?
A warm bath helps to get the gases into the respiratory system in the best possible way. The thermal stimulation induced by the bath puts the body in the best possible position for breathing.
To find out more, I talk about this at the beginning of this article : The Amazing Health Benefits of a Hot Bath.
The thermal caves
Another less attractive place for inhaling thermal vapours and gases is the thermal cave.
In this case, the point of emergence of a hot spring must be located in a natural geological cavity. The thermal spring should preferably have a high temperature (when it emerges). This saturates the cave with steam and creates a special microclimate. These thermal caves are also known as ‘vaporariums’ and are also used as saunas. Like the hot bath, the natural sauna is particularly effective in stimulating the body’s heat.
The best thermal baths have their own cave (natural or artificial).
To find out more about thermal caves, I invite you to follow my journey in Sicily through this article: Visit the Island of Pantelleria and its Natural Hot Springs. You’ll discover a cave that emits various gases such as hydrogen (H2), helium (He) and methane (CH₄).
Finally, it goes without saying that the interaction between these gases makes it possible to eliminate (or even limit) certain side effects that could be caused by the inhalation of a single gas, and to increase the therapeutic effectiveness.
The micro-organisms in a hot spring
In conclusion, the high diversity of micro-organisms present throughout a hot spring site can have a beneficial effect on the lung microbiota. To learn more about the microbiota of a hot spring, I invite you to read our article: The soil, the base layer and living medium of a hot spring.
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