When we remain for extended periods in crowded meeting rooms, enclosed classrooms, or poorly ventilated buildings, we often experience dizziness, difficulty concentrating, and even chest tightness and shortness of breath. Most people attribute these symptoms to "hypoxia" (oxygen deficiency). However, modern medicine indicates that the true culprit is often the quietly rising concentration of carbon dioxide CO₂ in the indoor air. Photo credit: unsplash An issue that cannot be

In winter, outdoor temperatures are low, and people tend to keep doors and windows tightly closed to maintain indoor warmth, resulting in poor air circulation between indoors and outdoors. Occupants continuously exhale CO₂ without corresponding ventilation measures, causing indoor CO₂ concentrations to accumulate continuously and greatly exceed standard levels. Photo credit: unsplash Research indicates that in ordinary living rooms with doors and windows closed, the activity

In modern cities, people spend more than 80% of their time indoors. However, have you ever felt dizziness, throat discomfort, fatigue, or even difficulty concentrating in certain buildings? This may be due to Sick Building Syndrome (SBS), and one of the culprits behind it is Total Volatile Organic Compounds (TVOC). Photo credit: unsplash Sources of TVOC Total Volatile Organic Compounds (TVOC) is the sum of various volatile organic compounds indoors, which readily volatilize a