Do you open your windows on a regular basis, even in the cold weather? If you do, you may be following a traditional German practice: lüften. And experts say there may indeed be some health perks to doing so. Many pollutants from outdoors build up and become more concentrated inside a home, joining indoor contaminants such as dander and carbon dioxide, says Deborah H. Bennett, PhD , an air quality researcher and professor of public health sciences at the UC Davis Health School of Medicine in Davis, California. “Opening windows will lower concentrations, improving indoor air quality.”
What Is Lüften? What It Is Lüften may be an unfamiliar word if you don’t speak German, but it can roughly be translated to the same meaning as the English word ventilation.e60dc2a1-f33c-4a05-9b50-8e3e8e597629306263b7-5592-493a-b031-a4edfd8245bc It’s the German practice of opening windows to air out a space and improve indoor air quality — and it’s seen as a way of life that supports values of health and cleanliness.e60dc2a1-f33c-4a05-9b50-8e3e8e597629c45efb2f-73a2-4034-a213-e2d9228a7068 One intention is to prevent mold, and while there are no hard and fast rules, Reddit posters note that Germans practice lüften once to a few times every day. As one TikToker who grew up in a German household in America noted, it’s an alternative to turning on the air-conditioning, a more common practice in American homes. This practice of airing out the home is not exclusive to Germany. In the United States, both the American Lung Association and the Environmental Protection Agency have long promoted opening doors and windows to improve indoor air quality when the outdoor air quality is good, says Jill Heins-Nesvold , the St. Paul–based national senior director of health systems improvement and indoor air quality at the American Lung Association, and a public health instructor at St. Mary’s University of Minnesota.
What Are the Benefits of Lüften? Benefits Lüften can provide a number of potential benefits, from better air quality inside your home to improved mental health. 1. Improved Indoor Air Quality Most home cooling and heating systems don’t bring fresh air into the house, so opening a window can improve the ventilation rate (how quickly outdoor air replaces indoor air).e60dc2a1-f33c-4a05-9b50-8e3e8e5976299c787ec0-9d6b-4ee9-9574-dd215122ac87 One problem of inadequate ventilation is that it can cause moisture to build up indoors, promoting mold growth.e60dc2a1-f33c-4a05-9b50-8e3e8e59762962112741-6697-41cb-a0b7-5ea96eea07ec “Opening doors and windows allows fresh, outdoor air to come indoors, diluting any indoor air pollutants in the home — such as carbon monoxide, carbon dioxide, volatile organic compounds, animal dander, and dust,” says Heins-Nesvold. Cooking with a gas stove, lighting candles, and spraying household cleaners are among the common indoor contaminants you may regularly encounter.e60dc2a1-f33c-4a05-9b50-8e3e8e5976293b1ee241-c231-4682-b89a-93f03229a954 Research shows that good natural ventilation, including airflow from open windows, can greatly improve indoor air quality, reducing indoor pollutants by diluting them with outdoor air.e60dc2a1-f33c-4a05-9b50-8e3e8e597629ae87aae1-38f5-4a76-8ed4-4e08adc32a5f That study was conducted in Uganda (which notably has a different climate and environmental pollution sources than the United States). Even so, Heins-Nesvold says the bottom line is the same for households elsewhere: Good ventilation is key to curtail the contaminants that come from cooking. Good ventilation can also help reduce the spread of common respiratory viruses, such as flu and respiratory syncytial virus (RSV) .e60dc2a1-f33c-4a05-9b50-8e3e8e59762982da3319-cd47-4caa-94ee-c68e99f79269 2. Better Respiratory Health Clean indoor air helps keep your lungs healthier by reducing exposure to particulate matter from smoke, mold, dust, chemical fumes, and tiny germ-carrying droplets in the air.e60dc2a1-f33c-4a05-9b50-8e3e8e5976293b44f8c9-9117-449a-9b80-837858bd73d7 Poor air quality in homes can lead to respiratory issues and other health complications.e60dc2a1-f33c-4a05-9b50-8e3e8e597629ae87aae1-38f5-4a76-8ed4-4e08adc32a5f “Indoor air pollution can impact anyone, at any stage of life,” says Heins-Nesvold. But some groups are more at-risk than others for these reasons: Children are still developing their immune systems and have faster respiratory rates than adults, with a higher volume of air for their body weight, according to research from Brazil.e60dc2a1-f33c-4a05-9b50-8e3e8e597629e493412e-c340-439b-bab1-c404d55791eb Older adults may be less resilient to the harmful effects of pollutants.e60dc2a1-f33c-4a05-9b50-8e3e8e597629fe5c2826-d9ef-4995-956e-4a9e0fe9ae1e People with preexisting health conditions such as chronic obstructive pulmonary disease (COPD) , asthma , lung cancer , and diabetes are vulnerable because air pollution can worsen these diseases.e60dc2a1-f33c-4a05-9b50-8e3e8e597629ad89874b-5a89-4057-8897-9d93631050a9 Individuals who are pregnant and their babies are at higher risk because of physiological changes during pregnancy, more exposure from higher air intake, and the developing fetus’s vulnerability to environmental toxins, says Heins-Nesvold. 3. Improved Mental Well-Being and Cognition Poor air quality might affect mental well-being. Although there’s limited and mixed evidence on the impact of indoor air quality on mental health, observational evidence suggests there’s a link between outdoor air pollutants and mental health problems like depression , anxiety , personality disorders, and schizophrenia .e60dc2a1-f33c-4a05-9b50-8e3e8e5976297787d1a7-9baa-41e4-8c2e-ece5a6e5d5e4 Indoor air pollution may also impact cognitive function and learning. “For example, poor indoor air quality is linked to a variety of harmful outcomes, including drowsiness, headaches, concentration problems, and decreased academic performance and learning,” says Heins-Nesvold. One small study indicates that graduate students score lower on cognitive tests when there’s less fresh air in classrooms.e60dc2a1-f33c-4a05-9b50-8e3e8e597629b8718b4d-90ef-4a25-ba0a-2c6c99d6d475 Certain indoor air pollutants like volatile organic compounds (VOCs) are also linked to headaches .e60dc2a1-f33c-4a05-9b50-8e3e8e59762903c1312a-c890-4195-8585-a1131a46da2f
6 Tips for Practicing Lüften 6 Tips for Practicing Lüften Lüften is easy to practice at home, but it’s not right for every situation. Here’s how and when to practice lüften for the best results. 1. Let In Enough Air “Open the doors and windows completely for fresh air exchange,” says Heins-Nesvold. That said, if you can’t open them completely, even a slightly cracked window can help with ventilation.e60dc2a1-f33c-4a05-9b50-8e3e8e5976291e7c52a5-b8b4-494b-9c64-4a72d06477f9 2. Practice Lüften 1 to 2 Times per Day “Consistency is key,” says Heins-Nesvold. “Instead of opening your doors and windows for one hour once a week, open them once or twice daily for 10 to 15 minutes. Think morning and night.” You can also use your ceiling fans to improve airflow, preferably when the windows are open.e60dc2a1-f33c-4a05-9b50-8e3e8e5976295d0ba6de-aa79-4663-86c2-cfb7366097bc 3. Get Strategic About Which Windows You Open “Create a cross-breeze to increase the airflow,” says Heins-Nesvold. “This means open doors and windows on opposite sides of the home.” Research from Japan shows that window placement has an even stronger effect on airflow and ventilation than building layout.e60dc2a1-f33c-4a05-9b50-8e3e8e59762990186f21-d15e-4e77-97df-9c7333c81f72 4. Don’t Open Windows During Poor Air Quality Days This includes when wildfires have been reported nearby. Also, skip opening your windows when it’s raining, since this can increase the indoor humidity rather than reduce it, says Heins-Nesvold. Instead, she recommends using a portable mechanical HEPA air cleaner to capture polluted air and remove particulate matter, chemicals, and other pollutants when you can’t open your windows. 5. Skip Lüften if You Live Near Certain Sources of Pollutants For instance, if your home is near a busy freeway or coal-burning factory, it may actually be best to keep your windows closed and use an air cleaner instead, says Heins-Nesvold. 6. Also Consider Allergy Season “If any of the members of the house have seasonal allergies, windows should remain shut during allergy season,” says Dr. Bennett. For those who have allergies , air filtration can reduce airborne allergens and offer relief.e60dc2a1-f33c-4a05-9b50-8e3e8e59762920e7ad58-4a33-4010-9c08-e3c86473142d
The Takeaway Lüften is the German practice of opening windows every day to ventilate the home and improve air quality. Research suggests that better indoor air quality is linked to benefits such as better respiratory health, improved mental health, lower risk of airborne disease, and prevention of mold. There are certain cases in which lüften should not be practiced, including during times of increased outdoor pollution or if someone in your household is affected by seasonal allergies.
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