2024 Yes The Adverse Associations of Classrooms’ Indoor Air Quality and Thermal Comfort Conditions on Students’ Illness Related Absenteeism between Heating and Non-Heating Seasons—A Pilot Study https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7914660/ Deng, Shihan North America Exposure Students Elementary (K-5) Temperature Humidity Carbon Dioxide (CO2) Particulate Matter (PM) Absenteeism Absence rate Attendance Seasonal variation Midwest US IAQ and thermal comfort in 85 Midwestern US classrooms were linked to illness-related absenteeism (IRA). During non-heating, increased fine particles raised IRA by 3%; during heating, higher CO2 raised IRA by 3%, showing seasonal differences in risk factors. 2021