Which of the following indicators may suggest poor ventilation in a home?

High humidity levels or condensation in a home is a strong indicator of poor ventilation. When a space is not properly ventilated, moisture from daily activities such as cooking, bathing, and even breathing can accumulate in the air. Unless there is adequate airflow to remove this moisture, it can lead to high humidity levels. This excess humidity can cause condensation on windows, walls, and other surfaces, creating an environment conducive to mold growth and potential damage to the structure of the home. Proper ventilation helps to manage indoor humidity levels by allowing moisture-laden air to escape and be replaced with drier air from outside, thereby maintaining a healthier and more comfortable living environment.