Ozone Initiated Secondary Emissions of Aldehydes from Indoor Surfaces


Surfaces in the presence of ozone may contribute significantly to indoor air pollution. Ozone-induced formation of aldehydes was studied to determine how daily use consumer products contribute to secondary emissions. A field ready method was developed to quantify secondary emission rates on existing surfaces. Four different products, canola cooking oil, a spray cooking oil, bath soap, and a liquid detergent, were evaluated after being coated on a laminated countertop. Upon exposure to 100 ppb O3, nonanal and hexanal were emitted at rates similar to secondary emission rates from carpet. Total aldehyde emission rates from canola oil, soap, and spray cooking oil were respectively 180, 110, 125 µg m-2 h-1. The liquid detergent released small amounts of hexanal, octanal, and nonanal. The aldehyde emission pattern from these products roughly correspond to the anticipated relative aldehyde emission rates due to the proportion of unsaturated fatty acids in vegetable oils and animal fats. If a substantial area of indoor surfaces are coated with these products, secondary emission rates of aldehydes (especially nonanal) may result in concentrations approaching or exceeding odor thresholds.

Meeting Name

A&WMA 98th Annual Conference and Exhibition


Civil, Architectural and Environmental Engineering

Keywords and Phrases

Secondary Emission Rates (SERs)

Library of Congress Subject Headings

Indoor air quality

Document Type

Article - Conference proceedings

Document Version


File Type





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