title: Impact of surface ozone interactions on indoor air chemistry: A modeling study.
abstract: An INdoor air Detailed Chemical Model was developed to investigate the impact of ozone reactions with indoor surfaces (including occupants), on indoor air chemistry in simulated apartments subject to ambient air pollution. The results are consistent with experimental studies showing that approximately 80% of ozone indoors is lost through deposition to surfaces. The human body removes ozone most effectively from indoor air per square meter of surface, but the most significant surfaces for C6-C10aldehyde formation are soft furniture and painted walls owing to their large internal surfaces. Mixing ratios of between 8 and 11 ppb of C6-C10aldehydes are predicted to form in apartments in various locations in summer, the highest values are when ozone concentrations are enhanced outdoors. The most important aldehyde formed indoors is predicted to be nonanal (5-7 ppb), driven by oxidation-derived emissions from painted walls. In addition, ozone-derived emissions from human skin were estimated for a small bedroom at nighttime with concentrations of nonanal, decanal, and 4-oxopentanal predicted to be 0.5, 0.7, and 0.7 ppb, respectively. A detailed chemical analysis shows that ozone-derived surface aldehyde emissions from materials and people change chemical processing indoors, through enhanced formation of nitrated organic compounds and decreased levels of oxidants.
authors.affiliation: Environment Department, University of York, York, UK.
authors.forename: M
authors.initials: M
authors.lastname: Kruza
authors.affiliation: Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UK.
authors.forename: A C
authors.initials: AC
authors.lastname: Lewis
authors.affiliation: Department of Civil, Architectural, and Environmental Engineering, Missouri University of Science and Technology, Rolla, MO, USA.
authors.forename: G C
authors.identifier: 0000-0001-6876-7185
authors.initials: GC
authors.lastname: Morrison
authors.affiliation: Environment Department, University of York, York, UK.
authors.forename: N
authors.identifier: 0000-0002-5290-4779
authors.initials: N
authors.lastname: Carslaw
mesh_terms: D016902:Air Pollution, Indoor / Q000032:analysis*; D000447:Aldehydes / Q000032:analysis*; D004784:Environmental Monitoring; D006801:Humans; D008956:Models, Chemical; D010126:Ozone / Q000737:chemistry*; D012621:Seasons
chemical_list: D000447:Aldehydes; D010126:Ozone
keywords: C6-C10 aldehydes; indoor air quality; nitrated organic species; ozone deposition; skin emissions; surface chemistry