What do elevated carbon dioxide (CO2) levels indicate regarding indoor air quality?

Elevated carbon dioxide (CO2) levels in indoor environments are significant indicators of ineffective ventilation. When CO2 levels rise, it typically suggests that the air circulation is insufficient to remove indoor air contaminants, including CO2 generated by human respiration and other activities. In well-ventilated spaces, CO2 levels should generally be kept low, allowing for a healthier air quality and reducing the risk of discomfort or health issues associated with stale air.

Furthermore, while other factors like high humidity levels can impact indoor air quality, they are not directly indicated by elevated CO2 levels. Toxic gases may be present in poorly ventilated areas, but CO2 itself does not denote their presence specifically. Low temperatures, on the other hand, do not relate to CO2 levels and are influenced by other factors. Thus, recognizing elevated CO2 levels primarily points to the need for improved ventilation to enhance indoor air quality.