title: Contribution of ozone to airborne aldehyde formation in Paris homes.
abstract: Indoor aldehydes may result from ozone-initiated chemistry, mainly documented by experimental studies. As part of an environmental investigation included in the PARIS birth cohort, the aim of this study was to examine ozone contribution to airborne aldehyde formation in Paris homes. Formaldehyde, acetaldehyde and hexaldehyde levels, as well as styrene, nitrogen dioxide and nicotine concentrations, comfort parameters and carbon dioxide levels, were measured twice during the first year of life of the babies. Ambient ozone concentrations were collected from the closest background station of the regional air monitoring network. Traffic-related nitrogen oxide concentrations in front of the dwellings were estimated by an air pollution dispersion model. Home characteristics and families' way of life were described by questionnaires. Stepwise multiple linear regression models were used to link aldehyde levels with ambient ozone concentrations and a few aldehyde precursors involved in oxidation reactions, adjusting for other indoor aldehyde sources, comfort parameters and traffic-related nitrogen oxides. A 4 and 11% increase in formaldehyde and hexaldehyde levels was pointed out when 8-hour ozone concentrations increased by 20 μg/m(3). The influence of potential precursors such as indoor styrene level and frequent use of air fresheners, containing unsaturated volatile organic compounds as terpenes, was also found. Thus, our results suggest that ambient ozone can significantly impact indoor air quality, especially with regard to formaldehyde and hexaldehyde levels.
authors.affiliation: Université Paris Descartes EA 4064, Faculté des Sciences Pharmaceutiques et Biologiques, Laboratoire Santé Publique et Environnement, 4 avenue de l'Observatoire, 75006 Paris, France.
authors.forename: Fanny
authors.initials: F
authors.lastname: Rancière
authors.forename: Claire
authors.initials: C
authors.lastname: Dassonville
authors.forename: Célina
authors.initials: C
authors.lastname: Roda
authors.forename: Anne-Marie
authors.initials: AM
authors.lastname: Laurent
authors.forename: Yvon
authors.initials: Y
authors.lastname: Le Moullec
authors.forename: Isabelle
authors.initials: I
authors.lastname: Momas
mesh_terms: D000393:Air Pollutants / Q000032:analysis; D016902:Air Pollution, Indoor / Q000032:analysis*; D000447:Aldehydes / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods*; D006798:Housing / Q000592:standards; D010126:Ozone / Q000032:analysis*; D010297:Paris; D001335:Vehicle Emissions / Q000032:analysis
chemical_list: D000393:Air Pollutants; D000447:Aldehydes; D001335:Vehicle Emissions; D010126:Ozone