Finding F-0503

“Results indicate that CO2 levels peaked at 2324.2 ppm in autumn, significantly exceeding the 1000 ppm threshold, whereas spring levels remained below 953.4 ppm.”

Fedele et al. Measuring CO2 Concentration and Thermal Comfort in Italian University Classrooms: A Seasonal Analysis (2025). Sensors (Basel). Page 1. CKB 1332

Structure

Factor: Carbon dioxide (CO₂)
Population: university students
Setting: classroom, IT
Study design: seasonal monitoring of CO2, temperature and humidity with NDIR sensors and a microclimate system in three classrooms of the University of Tuscia (Viterbo, Italy) over 20 days in spring and autumn (class 4)
Effect: other 953.4
Averaging time: upper bound over the spring monitoring days
Caveat: the sentence states an upper bound for spring, not a measured peak; recorded as measure other

A Finding records what one published document states, verbatim and with its page. It is not a conclusion of Coridum; see the Claims that build on it.