David Lacko, Tomáš Prošek, Jiří Čeněk, Michaela Helísková, Pavel Ugwitz, Vojtěch Svoboda, Peter Počaji, Matěj Vais, Helena Halířová, Vojtěch Juřík, Čeněk Šašinka
Analytic and holistic cognitive style as a set of independent manifests: Evidence from a validation study of six measurement instruments
PloS one
given increased use air cleaners prevention measure classrooms covid19 pandemic study aimed investigate effects portable air cleaners hepa filters window ac fans realtime 1 minute concentrations pm less 25 microns pm25 less 1 microns pm10 two classrooms nonurban elementary school rhode island half school day settings randomized high low air cleaner fan descriptive statistics linear mixed models used evaluate impacts set conditions pm25 pm10 concentrations mean halfday concentrations ranged 3441 gm3 pm25 3439 gm3 pm10 average use fan air cleaner low setting decreased pm25 053 gm3 95 ci 064 042 use filter high compared low fan decreased pm25 010 gm3 95 ci 020 0005 pm10 use fan air cleaner low decreased concentrations 018 gm3 95 ci 036 001 use filter high compared low fan decreased concentrations 038 gm3 95 ci 055 021 general simultaneous use fan filter high result additional decreases pm concentrations compared simple addition appliances individual effect estimates study suggests concurrent separate use ac fan air cleaner nonurban classrooms low background pm may reduce classroom pm concentrations