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Serious air pollution can quickly degrade children’s brains

Serious air pollution can quickly degrade children’s brains

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Nowadays, in heavily polluted areas such as Mexico and Asia, many people choose to wear masks. In the world’s major cities, including Mexico City, Jakarta, New Delhi, Beijing, Los Angeles, Paris, and London, humans are polluting the air at a rate that the Earth cannot afford.

Most people think that air pollution is like dust, as small as the hair diameter (particulate matter), or even smaller (ultrafine particles). It is well known that respiratory diseases such as pneumonia, bronchitis and asthma are associated with air pollution. About 1 million children die of pneumonia each year, and more than half of them are directly related to air pollution.

The volume of the particles is very small and can enter the bloodstream from the lungs and enter the brain through blood circulation. In such cases, inflammation of the brain can occur, leading to loss of cells in the central nervous system and possibly increasing the risk of dementia such as neurodegenerative diseases, cognitive deficits, and Alzheimer’s disease.

Although aging can cause mild neurodegenerative diseases, severe air pollution can accelerate the deterioration of nerve cell inflammation. To make matters worse, such severe air pollution accelerates neurodegeneration at the peak of brain development (childhood).

This is indeed the case. Today, millions of children around the world breathe polluted air, which may expose them to premature cognitive deficits and the risk of neurodegenerative diseases such as Alzheimer’s disease. This is the status quo that we continue to damage the child’s brain and shorten its life.

Unexplained cause of child death

In the late 1990s, neuropathologist and paediatrician Lilian Calderón-Garcidueña published a report stating that early signs of neurodegeneration were associated with air pollution by testing the brain tissue of adults, children and dogs that were “accidentally” dead and of unknown cause. .

These brain organizations have one thing in common – they all live in Mexico City, one of the most polluted cities in the world.

Further research shows that there is often a rather serious situation in scientific reports. In diseased animals and humans, their unhealthy brain slice microscopic images show that tiny black spots surrounded by inflamed tissue are particles and ultrafine particles. Around the inflamed spots, you sometimes see streaks similar to scars, and you can see pink stems. These are the common amyloid plaques in the brain after death in patients with Alzheimer’s disease. I joined Lilian’s team as an expert in cognitive development neuroscience and neuroimaging. We use behavioral tests and shoot images of the target brain area to explore signs of precocious cognitive deficits in humans.

Children’s brain cognitive ability is significantly reduced

We found that the cognitive abilities of children in Mexico City decreased significantly compared to the normal population and other children with similar age, gender, family and neighborhood backgrounds living in less polluted areas. We can identify abnormal cognitive deficits in key brain development areas, the prefrontal, temporal, and parietal lobes of the cerebral cortex. We also found atypical cognitive phenomena in the auditory brainstem, which may be related to language developmental disorders. Children’s neuroimaging is consistent with the most severe damage in the white matter, and white matter provides a conductive communication link. We can prove that in many cases, the symptoms of neuroinflammation in children in Mexico City are much more serious than in children. Today, consistency can be drawn from similar findings in other large cities or other researchers: air pollution damages the brains of millions of children, so protecting them is critical to public health.

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Air pollution sounds alarm: air pollution is the worst in Turin, Paris and London

Air pollution sounds alarm: air pollution is the worst in Turin, Paris and London

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A few days ago, the data in the air quality report released by the European Environmental Agency AEA showed that Italy is the country with the largest number of deaths due to nitrogen dioxide in the EU countries, with an annual number of 14,600 people, which also tends to be critical in environmental pollution indicators. Prior to the 2016 environmental report, there were 3,000 people killed by ozone, and 58600 people died of PM2.5 exceeding the standard, ranking second in the EU.

According to the overall data, there are 372,000 people in the EU due to environmental pollution, which is a decrease from the 391,000 in 2015. Although Italy’s indicators are not good, but the number is also decreasing compared with 2015. In 2015, there were 20,000 people killed by nitrogen dioxide in Italy.

According to the 2017 data, the largest PM2.5 values ​​are in Eastern European countries (Bulgaria, Croatia, Czech Republic, Poland, Romania, Slovenia, etc.) and Italy. From the perspective of big cities, Turin, Paris and London are the most polluted cities in the EU. From the perspective of small cities, the content of PM2.5 and PM10 in Padova air quality is significantly exceeded, and the environment of 2 million Italians lives. All air indicators tend to be the lowest of the EU indicators. Relevant people said: “Italian air quality data is a cause for concern. We are the only country in the southern European countries whose air quality tends to be critical. This is a serious health injury to Italian residents, especially the elderly and children. We must be serious. Face this problem and solve it.

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Air pollution hazards are similar to ‘secondhand smoke’

Air pollution hazards are similar to ‘secondhand smoke’

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Air pollution is associated with many health risks associated with smoking, such as lung cancer, emphysema, heart disease, and stroke. The more you breathe, the higher the risk. People who never smoke, with the increase in air pollution levels, have an increased risk of developing lung cancer and dying.

Even a very low level of PM2.5 will quietly add to the death of cardiopulmonary disease. WHO Director-General Tedros Adenom Gebrisos believes that air pollution is a ‘new tobacco’.

Arden Pope believes that air pollution is more like second-hand smoke, living in areas with serious air pollution, more like living with people who smoke 2 or 3 packs a day. According to a study conducted by University of California scholar Richard Muller, in 2018, the average air pollution hazard of American residents is equivalent to 1/3 cigarettes per day. Recent studies have shown that breathing in lightly polluted air for 10 years causes the type of lung damage to be the same as smoking a pack of cigarettes a day for 29 years. In order to give people a clearer understanding of the degree of air pollution, two scholars in Paris, France, have developed an APP. This app can be converted into how much cigarettes to smoke based on the degree of air pollution. More and more research shows that from the brain to the bones, air pollution has barely missed any organ.

To alleviate environmental pollution is to let go of human beings.

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Don’t let indoor air pollutants become the longest companionship

Don’t let indoor air pollutants become the longest companionship

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Do you know that people spend 70% of their time in the house? I have escaped the smog and pollution outside, but I can’t hide the indoor pollutant killer. I don’t think it’s too stupid and naive to think that the friends who will stay in the house will not suffer from air pollution! Indoor pollution is smaller?

Seeing the increase in pollution outside, you might say: It doesn’t matter, it is safe to stay at home and not go out. But in fact, according to a 2010 study by the US Environmental Protection Agency, indoor pollution is more harmful than outdoor pollution.

According to the statistics of the World Health Organization (WHO), about 70% of a person’s life will be spent indoors, and the average daily intake of air is 12 cubic meters. Urban residents even spend about 70-90% of their time in various indoor environments. Over. Nearly half of the world’s people are exposed to indoor air pollution every day. In the face of this situation, do you still feel that ‘being indoors’ is safe?

Three types of pollutants in indoor air

In fact, every room space may contain invisible pollution. There are three main types of indoor air pollutants:

  1. Biological pollutants

Biological pollutants are characterized by small size but wide diffusion range and high speed, which can easily lead to allergic reactions such as sneezing, eye discomfort, cough and asthma. Hair and dandruff like pets and humans, pollen, various bacteria and viruses, dust and dust mites, and microorganisms are biological pollutants.

  1. Chemical pollutants

Most of the chemical pollutants come from families with smokers, decoration works, cleaning supplies and furniture. Prolonged exposure can irritate the skin, nerves and respiratory tract, posing a health hazard. For example, second-hand smoke, formaldehyde, benzene, helium, etc., are all chemical pollutants.

  1. Odor

The odor comes from pets, cooking, garbage and the human body. The odor is unpleasant and affects the home life and neighborhood environment.

The harm of indoor pollution is often overlooked by us, but it needs to be concerned and understood!

For ordinary people like us, protecting ourselves and our family is a top priority. Putting our air purifier at home is the most unrequited decision.

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Indoor air pollution has become a cause of many diseases?

Indoor air pollution has become a cause of many diseases?

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Before the Chinese got up, they used to turn on the radio to listen to the news and listen to the weather. Nowadays, everyone wakes up and looks directly at the mobile phone. The temperature is either cloudy or sunny. The most important thing is to look at the PM2.5 index outside – decide whether you need to wear a mask when you go out, because no one wants to be a ‘human flesh vacuum cleaner’.

Many people choose to stay indoors in the haze days, thinking that this can breathe less dirty air, but this may not be wise. Dr. Zhao Zhuohui, Department of Environmental Health, School of Public Health, Fudan University, said: There are statistics showing that 70%-90% of people’s daily activities are indoors. If the outdoor atmosphere is polluted, it will affect the indoor air quality, and the indoor environment itself. There are also many sources of pollution, and the superposition of the two will cause serious indoor air pollution.

Is the indoor air worse?

In fact, according to the ‘Indoor Air Pollution and Health’ released by the World Health Organization in September 2011, the degree of indoor air pollution is 5-10 times higher than outdoor pollution, and 4% of global diseases are related to indoor air quality. It is worth noting that indoor pollution is mainly caused by the use of solid fuels in households under open fire and open stove conditions. This cooking and heating practices can cause high indoor air pollution and produce a large number of pollutants that are harmful to health, including permeable to Tiny particles of smoke in the deep lungs. Sources of particulate matter in indoor air typically include coal-fired heating, tobacco smoke, cooking fumes, plant pollen, and indoor human activities.

The haze weather will cause serious harm to human health. Cold, tight or dumb, persistent cough, rhinitis, dizziness and fainting are all early symptoms caused by smog. If you do not pay attention to the respiratory protection of smog, it is more likely to cause A series of serious consequences including cardiovascular disease, respiratory disease, and cancer. For the time being, wearing a mask and a household air purifier is a more effective means of smog protection.

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2019 indoor air pollution status

2019 indoor air pollution status

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The degree of indoor air pollution decreases as the number of renovations is completed! The office is the hardest hit by air pollution, with a failure rate of up to 90%. In the measurement of scenes such as homes, offices, schools, government and financial institutions, the proportion of office air quality is the highest, reaching 90%. The pass rate of the family is 35%; the pass rate of the government and financial institutions is 20%; the pass rate of the school is 23%.

The higher the temperature, the more harmful gases are released.

The indoor air quality is related to the ambient temperature. It can be seen from the qualification rate and the ambient temperature that the pass rate has a negative correlation with the temperature increase.

Choose environmentally friendly decorative materials

The selection of materials that meet national standards and low pollution is fundamental to reducing the amount of pollutants in indoor air. Use paints, glues and coatings produced by regular manufacturers; use non-polluting or less polluting water-based materials.

Choose a reasonable decoration design and construction process

Selecting a reasonable decoration design can maximize the use of space and indoor ventilation; choosing a reasonable construction process can also effectively prevent indoor pollution sources.

Effective ventilation is a more effective technical measure to control indoor pollution

It is a key measure to reduce pollution by using indoor air purifiers and new fans that have effective effects, increasing the frequency of indoor ventilation, always maintaining good ventilation conditions, and opening windows when outdoor air is good.

At present, indoor environmental pollution is also becoming more and more serious. About 300 kinds of pollutants can be detected indoors, and about 60% of human diseases are related to air pollution.

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Indoor air pollution

Indoor air pollution

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Usually we think that air pollution is outdoors, but the air in the home or office may also be contaminated. Indoor pollution sources include:

  • Mold and pollen
  • Tobacco smoke
  • Household products and pesticides
  • Gases such as helium and carbon monoxide
  • Building materials such as asbestos, formaldehyde and lead

Usually indoor air quality problems can only cause discomfort. Most people will feel much better once they have eliminated the source of pollution. However, some pollutants can cause diseases such as respiratory diseases or cancer after a long time.

Three basic strategies for controlling indoor air pollution

Control pollution source

In general, the most effective way to improve indoor air quality is to eliminate individual sources or reduce their emissions. Some sources of pollution, such as sealing or sealing products containing asbestos sources; others are adjusting gas stoves to reduce emissions.

Improve ventilation

Open windows and doors, adjust windows or attic fans if weather permits. A fan in the bathroom or kitchen directly vents indoor air to the outside to remove contaminants and also increases outdoor air ventilation.

Air purifier

The effectiveness of an air purifier depends on the extent to which it collects contaminants in the indoor air and the amount of air that is drawn through the cleaning or filter elements. Another important factor in determining the effectiveness of an air purifier is the intensity of the source.

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In addition to ventilation, how should you solve indoor air pollution?

In addition to ventilation, how should you solve indoor air pollution?

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Since I was pregnant with my baby, it was a surprise and a scare. I was delighted by the birth of a new life to the future. I was shocked that you could never foresee where the danger came from.

The most worrying thing is that after changing the air quality problem after the new home, although everyone knows the harm of formaldehyde, how to detect the formaldehyde content in the environment in the life of the schedule? How to effectively deal with formaldehyde? Which purifiers on the market have the best effect in addition to formaldehyde? We have no way of knowing.

Not only that, there are always some unavoidable reasons for the baby to be exposed to formaldehyde. For example, some of the mothers have to be forced to inhale formaldehyde due to work reasons, resulting in physical discomfort and worry about the baby. Some treasured mothers are forced to survive by reality. Some treasure mothers do not pay attention to the hazards of formaldehyde. After the renovation of the new house, they will stay in the room until the baby’s body appears abnormally and suddenly wake up and regret it!

The harm of formaldehyde can not be underestimated

In fact, excessive formaldehyde caused by decoration is an important predisposing factor for blood diseases such as leukemia and lymphoma. The National Institutes of Health has determined that formaldehyde is a known human carcinogen, and the World Health Organization has identified formaldehyde as a ‘type 1 carcinogen.’ If the concentration of formaldehyde in the air is too high, it will obviously stimulate the mucous membrane, damage the respiratory system and even cause cancer; even if the concentration is not high, long-term exposure may lead to chronic respiratory diseases. Especially for children and the elderly who are weaker, the harm is even greater.

In addition to opening the window, the 4 major methods of removing formaldehyde

  1. Plant purification method: Can green radish remove formaldehyde?

After decorating a new home, can you clean the formaldehyde by placing plants such as green radish? In 1984, Wolverton and other studies showed that the rate of formaldehyde release is much higher than the rate at which plants remove formaldehyde and benzene from the air. It is obviously unrealistic to rely solely on the absorption of formaldehyde by plants. Plant absorption can be said to be almost negligible. In fact, formaldehyde is not only harmful to humans, but also a ‘toxic’ to plants. Formaldehyde can damage plant cells, causing damage and death of plant leaves. Considering that plants still have certain ornamental value, combining plant absorption with other methods is a practical method to solve the current indoor formaldehyde and benzene pollution.

  1. Fresh air system: auxiliary ventilation

The fresh air system is essentially a ventilator that ensures fresh air in the smog. However, the air exchange rate of the general fresh air system is still much worse than that of the direct window ventilation. It can be used as an aid when the weather is not allowed to open the window. In addition, the fresh air system is best to choose the central fresh air system, which means that it must be designed in the early stage of the renovation.

  1. Activated carbon: easy to transform pollution source

What is the effect of bamboo charcoal on formaldehyde removal? The optimum adsorption conditions for bamboo charcoal for formaldehyde are 3 hours, especially in the case of high temperatures in summer. Once this time is exceeded, formaldehyde is easily desorbed, run out of bamboo charcoal, and enter the air again, which becomes a secondary source of pollution.

  1. Air Purifier: taking into account the choice of formaldehyde removal and PM2.5

The biggest advantage of air purifiers is the dual purification of formaldehyde and PM 2.5.

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Indoor air pollution can not be ignored, the baby becomes the main victim, and purifying the air is serious!

Indoor air pollution can not be ignored, the baby becomes the main victim, and purifying the air is serious!

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Since the hazards of PM2.5 have been successively popularized, it has caused widespread concern about air quality in the whole society. Mothers have paid attention to the damage of outdoor air pollution to the baby. Therefore, in order to avoid air pollution, the baby is often kept at home or indoors (such as playgrounds, classrooms).

According to a survey, urban residents spend 2.35 hours a day studying, working and living indoors, accounting for 92% of the whole day. It can be seen that our indoor activities are much higher than outdoor, and there is really no indoors. Is the air polluted?

According to research published by the World Health Organization and the US Environmental Protection Agency, indoor air pollution levels are generally much higher than outdoor environmental pollution, usually 2 to 5 times, and in extreme cases more than 100 times. The main targets of this hazard are elderly, infirm, pregnant women and children, especially babies are more vulnerable than adults, so indoor air pollution is also a warning to infants and young children.

The harm of air pollution to your baby, you never think of it.

Minors, especially infants, breathe more air than adults (according to the amount of breath/weight ratio), so they contact and inhale more indoor pollutants. Why do you say this way? Because the baby’s body is in the developmental stage, the metabolism is fast, and it is relatively active, so the respiratory rate is faster, the breathing volume is 50% higher than the adult weight, and at the same time, the baby’s body defense system is not fully developed, therefore, in the air Contaminants have a greater impact on your baby’s health than adults.

■ Chemical pollutants in indoor air

Baby’s breathing rate and metabolism are faster than adults, but their immune system is not perfect, so when inhaling dirty air, your baby is more vulnerable to health risks. For example, sulfur dioxide in the air can cause the lumen of the trachea and bronchi to shrink, making the baby difficult to breathe and even induce asthma; the baby is more sensitive to PM2.5 than adults, and can cause damage to the respiratory and cardiovascular systems; The absorption rate of lead in harmful air is 1.6~2.7 times that of adults. Excessive blood lead will lead to ADHD, learning difficulties, short stature, anemia, and emotional instability.

■ Indoor air pollutants brought by decoration

The main source of indoor air pollution is the decoration of the house, especially the pollution hazard of the new house decoration is particularly serious!

Formaldehyde: strong glare and colorless gas, release time for up to 15 years, has carcinogenic effects;

Benzene: special aromatic odor, mainly including benzene, toluene, xylene, etc. Mild pollution can cause neurasthenia-like symptoms such as dizziness, insomnia, and apathy; long-term exposure to low doses of benzene can cause aplastic anemia, which can lead to leukemia in severe cases;

Ammonia: Strong odor irritating odorous gas. Can cause tears, sore throat, hoarseness, cough, bloodshot, chest tightness, difficulty breathing, and can be accompanied by dizziness, headache, nausea, vomiting, fatigue, etc., when severe, pulmonary edema can occur;

Radon: Radioactive inert gas, colorless and odorless, with an incubation period of 15-40 years. Strong carcinogens recognized by the World Health Organization, especially lung cancer;

TVOC: refers to volatile organic compounds, divided into eight categories: alkanes, aromatics, alkenes, halocarbons, esters, aldehydes, ketones and others, is a general term for all volatile organic compounds in the room. TVOC evaporates into the air at room temperature. Its toxicity, irritation, carcinogenicity and special odor affect the skin and mucous membranes and cause acute damage to the human body.

Nearly 70% of newly renovated houses are unqualified for air testing, and children’s rooms are more polluted.

Parents usually pursue aesthetics for children’s rooms, and strive to give children the most attractive and childhood color design, so more decoration materials will be involved in the decoration, and the layout will be more colorful. But whether the decoration materials are environmentally friendly is not something that parents can control – paints, paints, plates, wallpapers, etc., will emit more than 500 kinds of toxic and harmful compounds.

To avoid pollution, my mother must do the following

Start with diet and improve your baby’s immunity

■ Eat more vegetables and fruits rich in vitamins;

■ Eat more fungus, Sydney, white fungus, lotus seeds, lily and other lung foods;

■ Give your baby more detox foods such as carrots, garlic, figs, grapes, cucumbers, and cherries;

■ Give your baby more foods such as Flammulina velutipes, jujube, and rough glutinous rice to enhance immunity and anti-allergy;

■ Eat more green onions, garlic and other foods that can be sterilized in the body. For example, when you change seasons, you can give your baby some raw garlic, which will effectively prevent influenza and respiratory diseases.

■ Drink plenty of water, this principle is almost always eaten!

Go to the green park for outdoor activities

When the weather and air quality are good, you must bring your baby to outdoor activities, and there are fewer particles in the air. If possible, take a child out of the country once a month, thoroughly clear the lungs, which is good for health.

Ensure that the air entering the room is clean and fresh

Conventional ventilation and ventilation methods are no longer practical. In some cities in China, the number of heavy pollution days has reached half in one year, and the outdoor is foggy. Is ventilation not ‘leading the wolf into the room’? In order to prevent a large amount of dust from accumulating indoors and affecting the baby’s breathing health, the mother needs to choose a professional new fan for the children’s room to exchange oxygen and oxygen to ensure that the baby breathes clean and fresh air every day.

Place air purification products indoors, especially in children’s rooms

The methods mentioned above have certain limitations. What if you need to stay indoors and maintain a certain temperature? For example, there is heating or air conditioning, so it is not suitable to open the window. Therefore, it is necessary to equip the children’s room and even all rooms with air purification products. The good purification system can not only filter out most of the particulate matter in the air, but also remove formaldehyde and other decoration pollution, giving the baby a healthy growth environment.

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Indoor air pollution is heavy, is your heart and lungs still okay?

Indoor air pollution is heavy, is your heart and lungs still okay?

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In the winter, indoor air pollution is sometimes more serious than outdoor. Indoor air pollution includes not only PM2.5, but also volatile chemical TVOCs such as decorative materials, floor furniture, formaldehyde, and other chemical pollutants, as well as various bacteria, viruses, and dust mites. In addition to symptoms such as throat discomfort, allergies, and cough, it can also damage human health, especially the respiratory system and cardiovascular and cerebrovascular diseases, and even become a cause of major diseases.

Indoor air pollution increases lung cancer risk

For indoor air pollution sources, indoor pollution sources are more and more complicated than outdoor ones. Outdoor pollutants enter the room through doors and windows, and indoor pollutants can not be discharged in a closed environment, especially in winter, indoor ventilation is less high, formaldehyde and other substances in furniture are easy to volatilize, dust mites, bacteria, etc. are also likely to be aggravated. The concentration of pollutants is relatively higher, and the lungs, as an important organ for gas exchange between the human body and the outside world, are the first to be affected.

‘Smoking is a recognized cause of lung cancer. In recent years, tobacco control has reduced the number of smokers, but the incidence of lung cancer has not decreased.’ Professor Liu Youning said, ‘This is related to the environmental impact of lung cancer incidence. ’

After the pathological analysis of more than 15,000 cases of lung cancer in the hospital in the past 10 years, the Cancer Hospital of Chinese Academy of Medical Sciences also found that the pathological type of lung cancer has changed significantly: the former lung cancer is mostly squamous cell carcinoma, but now the proportion of adenocarcinoma is larger. Yang Gonghuan, a professor at the Institute of Basic Medical Sciences of the Chinese Academy of Medical Sciences who participated in the study, said: ‘Small particles of PM2.5 can enter deep into the alveoli and have a causal relationship with the occurrence of adenocarcinoma.’

In addition to lung cancer, air pollution also increases the risk of chronic obstructive pulmonary disease in ordinary people, and it also increases the risk of hospitalization and death in patients with chronic obstructive pulmonary disease, Professor Liu Youning said. One study showed a high correlation between high concentrations of PM exposure and increased incidence of chronic obstructive pulmonary disease and decreased lung function.

The World Health Organization (WHO)’s ‘Air Pollution and Child Health: Clean Air is a Good Strategy’ report clearly states that air pollution increases the risk of childhood asthma and leads to childhood cancer.

Indoor air pollution causes heart disease

Xu Yawei, chief physician of the Department of Cardiology, Shanghai Tenth People’s Hospital, pointed out that air pollution can be more than just lungs. The British Lancet online magazine reported that the British NHS (National Health Service System) publication showed that air pollution can increase heart failure. Hospitalization and death, if reduced, can prevent heart failure hospitalization and save a lot of health care costs.

The researchers analyzed 35 studies from 12 countries and assessed the health effects of air pollution, including heart failure. The results show that all gas and particulate air pollutants (except ozone) are associated with increased hospitalization or death from heart failure.

The results of a study published in the journal Circulation also show that people who live near the road and are exposed to nitrogen dioxide or PM2.5 for a long time are more prone to left and right ventricular hypertrophy. Moreover, the more serious the air pollution, the more obvious this problem of ventricular hypertrophy. Similar heart changes can also be observed in the early stages of heart failure.

Professor Xu Yawei analyzed that air pollution increases the body’s systemic inflammatory response, causing the body to be in an oxidative stress state, increasing the risk of heart disease. Outdoor air is less than indoor dust, but the impact on health is basically the same.

The biggest damage to three types of people

There are three main types of susceptible people with indoor air pollution: the elderly, pregnant women and children.

First, the body of the elderly, pregnant women, and children is less immune and weaker.

Second, they spend relatively long hours in various indoor places.

Third, children and pregnant women breathe faster than the average person, and the amount of air inhaled per unit of body weight is more.

Air purifier for indoor air

In order to solve indoor pollution problems, many people use air purifiers to improve air quality, and even many homes have multiple units to provide clean air for each room. Qualified air purifiers can effectively filter ultra-fine particle pollutants such as viruses, bacteria, allergens, PM2.5, and even some products can also absorb harmful gases such as formaldehyde. At present, air purifiers are the best choice to prevent indoor air pollution.

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