2022 Yes https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9111572/ Sanguinetti, Angela North America Exposure Study Teachers Carbon Dioxide (CO2) Air quality Classrooms Occupant perceptions Thermal comfort Ventilation Teachers were not educated regarding mechanical ventilation. Errors in HVAC system installation and programming contributed to misunderstandings (because mechanical ventilation was often not performing as it should) and even occasionally made it possible for teachers to turn off the HVAC fan (to reduce noise). Teachers did not accurately perceive (in)sufficient ventilation; in fact, those in classrooms with poorer ventilation were more satisfied with IEQ, likely due to more temperature fluctuations when ventilation rates were higher combined with occupants’ tendency to conflate perceptions of air quality and temperature.