Health risks of poor indoor ventilation and high humidity

Medical experts and environmental guidelines warn that keeping doors and windows closed for extended periods, particularly in bathrooms or during rainy seasons, can pose significant health risks due to poor ventilation and high humidity.

In bathrooms, failing to ventilate after use can trap moisture, leading to mold growth. The U.S. Environmental Protection Agency (EPA) emphasizes that controlling humidity is essential to prevent mold, which produces allergens that can cause respiratory issues, especially in the elderly. Signs of excessive moisture include fogged mirrors, damp towels, musty odors, and dark spots on walls or grout.

During rainy weather, doctors warn that sealing homes to block rain or wind can reduce natural airflow. Dr. Nguyen Thi Bich Uyen from Le Van Viet Hospital notes that stagnant, humid air allows biological and chemical pollutants, such as bacteria, viruses, and fungi, to accumulate. This environment can exacerbate chronic obstructive pulmonary disease (COPD), allergies, and asthma. Furthermore, high humidity and poor ventilation can negatively impact cardiovascular health by making it harder for the body to regulate temperature, placing additional strain on the heart.