dc.contributor.authorRim, Donghyun
dc.contributor.authorGall, Elliott Tyler
dc.contributor.authorMaddalena, Randy L.
dc.contributor.authorNazaroff, William W.
dc.identifier.citationRim, D., Gall, E. T., Maddalena, R. L., & Nazaroff, W. W. (2015). Ozone reaction with interior building materials: Influence of diurnal ozone variation, temperature and humidity. Atmospheric Environment, 125, 15-23.en_US
dc.description.abstractElevated tropospheric ozone concentrations are associated with increased morbidity and mortality. Indoor ozone chemistry affects human exposure to ozone and reaction products that also may adversely affect health and comfort. Reactive uptake of ozone has been characterized for many building materials; however, scant information is available on how diurnal variation of ambient ozone influences ozone reaction with indoor surfaces. The primary objective of this study is to investigate ozone-surface reactions in response to a diurnally varying ozone exposure for three common building materials: ceiling tile, painted drywall, and carpet tile. A secondary objective is to examine the effects of air temperature and humidity. A third goal is to explore how conditioning of materials in an occupied office building might influence subsequent ozone-surface reactions. Experiments were performed at bench-scale with inlet ozone concentrations varied to simulate daytime (ozone elevated) and nighttime (ozone-free in these experiments) periods. To simulate office conditions, experiments were conducted at two temperatures (22 °C and 28 °C) and three relative humidity values (25%, 50%, 75%). Effects of indoor surface exposures were examined by placing material samples in an occupied office and repeating bench-scale characterization after exposure periods of 1 and 2 months. Deposition velocities were observed to be highest during the initial hour of ozone exposure with slow decrease in the subsequent hours of simulated daytime conditions. Daily-average ozone reaction probabilities for fresh materials are in the respective ranges of (1.7-2.7) × 10-5, (2.8-4.7) × 10-5, and (3.0-4.5) × 10-5 for ceiling tile, painted drywall, and carpet tile. The reaction probability decreases by 7%-47% across the three test materials after two 8-h periods of ozone exposure. Measurements with the samples from an occupied office reveal that deposition velocity can decrease or increase with time. Influence of temperature and humidity on ozone-surface reactivity was not strongen_US
dc.description.sponsorshipNRF (Natl Research Foundation, S’pore)en_US
dc.format.extent26 p.en_US
dc.relation.ispartofseriesAtmospheric Environmenten_US
dc.rights© 2015 Elsevier Ltd. This is the author created version of a work that has been peer reviewed and accepted for publication by Atmospheric Environment, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1016/j.atmosenv.2015.10.093].en_US
dc.subjectDRNTU::Engineering::Environmental engineering::Environmental pollutionen_US
dc.subjectDeposition velocityen_US
dc.subjectReaction probabilityen_US
dc.subjectSurface agingen_US
dc.titleOzone reaction with interior building materials: Influence of diurnal ozone variation, temperature and humidityen_US
dc.typeJournal Article
dc.contributor.schoolSchool of Civil and Environmental Engineeringen_US
dc.description.versionAccepted versionen_US
dc.contributor.organizationBerkeley Education Alliance for Research in Singaporeen_US

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