Comparison of indoor air quality during sleep in smokers and non-smokers' bedrooms: A preliminary study.

People spend one third of their life sleeping, but the bedroom, as a specific micro-environment, is often neglected when assessing human exposure to air pollutants. However, exposure during sleep may be significant in the long-term to the integrated individual exposure. This study aimed to assess the exposure during sleep, focusing on a multi-pollutant approach (comfort parameters, carbon dioxide - CO, carbon monoxide - CO, formaldehyde (CHO), total volatile organic compounds (VOCs), particulate matter - PM and PM - and ultrafine particles, particle number concentrations - PNC - and lung deposited surface area - LDSA).