환기 refers to the process of exchanging indoor air with fresh outdoor air to improve air quality. This is important in maintaining a healthy living environment, as it helps to reduce indoor pollutants, moisture, and odors. Proper 환기 can prevent issues like mold growth and respiratory problems. There are various methods of 환기, including natural ventilation through open windows and mechanical systems like 환기팬 or 에어컨. Regular 환기 is especially crucial in enclosed spaces, such as 사무실 or 주택, where air can become stale and unhealthy over time.