Ozone-Initiated Secondary Emission Rates of Aldehydes from Indoor Surfaces in Field Homes: Surface Aging and Regeneration


Field experiments were conducted in four homes during the summers of 2005 and 2006 to evaluate the effects of aging and surface replenishment on ozone-initiated secondary emission rates (SERs) of aldehydes from indoor surfaces. Four surfaces in each home were examined: living room carpet, kitchen countertop, kitchen floor and bedroom carpet. Upon exposure to ozone for 3 h, C1 - C10 saturated aldehydes, especially nonanal, were emitted as products of ozone-surface reactions from all surfaces. during both summers carpet in the newer homes had higher SERs than carpet in the older homes. in the summer of 2005, nonanal SER ranged from 87 μg m-2 h-1 in a 2-year-old house to 8 μg m-2 h-1 in a house that was older than 10 years. in the summer of 2006, Nonanal SER from bedroom carpet was 82 μg m-2 h-1 in a relative new house, but only 2 μg m-2 h-1 in an old house. These results for houses of different ages suggest that carpet surfaces are less reactive in older homes. for most surfaces, total products yields were consistent for the same house from year to year, indicating that the types of ozone reactive precursors are similar from year to year. for example, in a 2-year old house, the total aldehyde yields for living room carpet were 0.39 and 0.36 in 2005 and 2006 respectively. Ozone deposition velocities are weakly correlated (roughly 1:1) from 2005 to 2006, suggesting that indoor surfaces do not age substantially in one year, on average.


Civil, Architectural and Environmental Engineering

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Article - Conference proceedings

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Publication Date

01 Jan 2007

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