In winter, doors and windows are often kept tightly closed—air pollution poses significant health risks.
Release date:
2025-09-01
Doors and windows are the eyes that connect people with nature—and they’re also essential, indispensable components of any building. In winter, when doors and windows are often kept tightly closed, indoor air pollution can pose significant health risks.
Living for extended periods in environments with doors and windows tightly closed can harm human health, one of the consequences being a higher incidence of allergic diseases.
Doors and windows are tightly shut, and the air is stale.
According to reports, cold weather often leads people to keep doors and windows tightly shut all day, resulting in significant air pollution risks. This is because the human body produces more than 500 chemical substances during metabolism, 149 of which are expelled through the respiratory system. As a result, the air becomes laden with harmful elements such as bacteria, viruses, carbon dioxide, and airborne particles. In poorly ventilated spaces, this can lead to insufficient oxygen supply to the brain, causing symptoms like dizziness, lightheadedness, and memory impairment. Moreover, prolonged lack of ventilation can also cause indoor allergen concentrations to rise, increasing the likelihood of allergic diseases. "Currently, dermatologists are seeing a growing number of cases of allergic dermatitis in clinical practice, and household items frequently serve as the primary source of these allergies," explains the expert. "Common allergens include dust mites, mold, pollen, and even air fresheners."
Open windows and expose to sunlight to eliminate dust mites.
Dust mites are one of the most common allergens. They thrive particularly in mattresses, pillow cushions, bedding, clothing, carpets, sofas, curtains—and even plush toys. Typically, humans inhale them while sleeping, which can lead to hours of mucosal congestion. As a result, many people experience more severe allergy symptoms—especially allergic rhinitis—in the morning. Additionally, when dust mite particles suspended in the air are breathed in, they can trigger allergic reactions in the nose, respiratory tract, and eyes.
Fresh outdoor air helps dilute indoor pollutants, so it’s important to regularly open windows to allow air circulation. Every week, expose your mattresses, blankets, and pillows to sunlight—it can help ease symptoms. Additionally, wash all bedding in water hotter than 50°C once a week to eliminate dust mites and their droppings. Avoid using carpets altogether, or if you do, opt for easy-to-clean options, and make sure to clean and vacuum your home regularly.
Ventilation, waterproofing, and mold prevention
Mold is also a common allergen. Mold is a type of fungus that lacks roots and leaves, and it can be found in most indoor environments. It reproduces by producing and releasing spores into the air.
The appearance of indoor mold is closely linked to humidity levels inside the home. Therefore, ensuring proper ventilation and waterproofing—while keeping your living space dry and clean—is an effective way to prevent mold-related allergies. You can use a dehumidifier to control indoor humidity, repair any leaks in toilets, bathrooms, kitchens, and basements, and limit the number of indoor plants to minimize moisture buildup. Additionally, regularly check that plant leaves and terracotta pots remain free of mold growth.
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