Skip to Main content Skip to Navigation
Theses

Ozone et qualité de l'air intérieur : interactions avec les produits de construction et de décoration

Abstract : The impact of ozone on indoor air quality has been studied using a double approach aimed at providing a better understanding of the ozone removal mechanisms on indoor surfaces and of ozone-induced reaction products identification, and to study the ozone outdoor-to-indoor transfer during photochemical pollution episodes.
An experimental setup has been developed to study the interactions between ozone and sixteen building materials frequently used indoors. For all tested materials, a significant ozone removal was observed: ranging between 8% on a paint and 89% on a pinewood board. Ozone deposition velocities on the different tested materials varyied from 0.003 to 0.158 cm•s-1. When materials are exposed to ozone, their emissions are modified. Some compounds are detected in lower concentrations (styrene, C12 alkene) while others compounds are detected at higher concentrations, particularly aldehydes (formaldehyde, acetaldehyde, benzaldehyde, C5 to C10 aldehydes), ketones and carboxylic acids. Tests were performed on pinewood board to characterize the relative contribution of heterogeneous and homogenous reactions on the ozone removal. Heterogeneous surface reactions prevailed since gas-phase reactions were limited to 5-20%.
The impact of photochemical pollution on indoor air quality was studied during summer of 2003 and 2004 in the CSTB experimental house MARIA. Outdoor pollution (NO, NO2 and O3) is completely transferred indoors though the ventilation system. 80% to 95% of ozone is eliminated indoors, showing the presence of important ozone sinks. Reaction by-products were identified, in particular formaldehyde hexaldehyde, benzaldehyde and nonanal. Heterogeneous reactions prevailed on gas-phase reactions, although alpha-pinene ozonolysis has been observed. Daily variations of ozone, formaldehyde and hexaldehyde indoor concentrations underlined the role of indoor chemistry and of environmental parameters (especially temperature) on the emissions of materials, and consequently on their indoor concentrations.
A simple model for predicting indoor pollution was developed. Input parameters were the corresponding outdoor pollutant concentrations. Both homogeneous and heterogeneous reactions were considered in the model. The model overestimated the indoor NO2 concentrations, presumably because NO2 surface deposition was not considered. An excellent agreement between predicted and measured indoor NO and ozone concentrations has been obtained.
Document type :
Theses
Complete list of metadatas

https://tel.archives-ouvertes.fr/tel-00134593
Contributor : Mélanie Nicolas <>
Submitted on : Friday, March 2, 2007 - 5:30:26 PM
Last modification on : Thursday, July 30, 2020 - 12:05:34 PM
Long-term archiving on: : Wednesday, April 7, 2010 - 1:19:35 AM

Identifiers

  • HAL Id : tel-00134593, version 1

Collections

Citation

Mélanie Nicolas. Ozone et qualité de l'air intérieur : interactions avec les produits de construction et de décoration. Océan, Atmosphère. Université Paris-Diderot - Paris VII, 2006. Français. ⟨tel-00134593⟩

Share

Metrics

Record views

1284

Files downloads

2969