2024 No Investigation of CO2 production depending on physical activity of students https://pubmed.ncbi.nlm.nih.gov/30068229/#:~:text=The%20highest%20increase%20of%20CO,increased%20with%20increasing%20physical%20activity. Kapalo, Peter Europe Review Teachers Students Temperature Humidity Carbon Dioxide (CO2) Educational buildings Indoor environment Carbon dioxide (CO2) Physical activity CO₂, temperature, and humidity were measured in two Slovak university classrooms. CO₂ often exceeded 1000 ppm, especially during exams and physical activity, indicating poor ventilation. Findings support improved airflow during active periods. 2019