It's about time: A comparison of Canadian and American time–activity patterns†

By J. Leech, W. Nelson, R. Burnett, S. Aaron, M. Raizenne. Journal of Exposure Analysis and Environmental Epidemiology, 2002

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Indoor Air Pollution, Related Human Diseases, and Recent Trends in the Control and Improvement of Indoor Air Quality (2020, background): “Indoor environment conditions contribute greatly to human wellbeing, as most people spend around 90% of their time indoors, mainly at home or in the workplace [1].”
A review and evaluation of intraurban air pollution exposure models (2005, background): “…patterns of activity between different populations, with individuals spending an average of about 66% of their time at their residential location (Leech et al., 2002), but these studies have not done enough to investigate the crucial question of ‘‘where’’ individuals are the rest of the time.”
Human internal and external exposure to PBDEs--a review of levels and sources. (2009, background): “North Americans spend more than 85% of their time indoors (Klepeis et al., 2001; Leech et al., 2002).”