A field intervention study of the effects of window and door opening on bedroom IAQ, sleep quality, and next-day cognitive performance

Indoor Air Quality (IAQ) and sleep quality measurements over a period of two weeks were performed all night in 40 bedrooms Denmark during the heating season. In first week, bedroom conditions typical what participants would normally experience sleep. second asked to open doors or windows if they had been closed opposite. A change 95 th percentile measured CO 2 concentration by more than 200 ppm expected direction on same weekdays two-week measurement was taken indicate that an effective intervention place. The 29 met this criterion grouped depending how manipulated. Objectively subjectively rated IAQ improved when except NO slightly higher. Sleep longer under condition assessed be better. Similar effects not observed although decreased as much open. No seen 11 which made did at least ppm, expected. present study provides evidence sufficient dilution and/or removal pollutants is necessary ensure good quality. • field conducted bedrooms. Perceived air , VOCs, PM 10 window after sleeping with window. Opening door reduced but provide any above benefits.