REACTIONS BETWEEN OZONE AND BUILDING PRODUCTS: IMPACT ON PRIMARY AND SECONDARY EMISSIONS

摘要

The purpose of this study is to document the influence of reactions of ozone on building products and on their emissions in indoor air. For this purpose, 12 building products were exposed to ozone in a dedicated experimental setup. The measured ozone removal rate is relatively low on paint (7 %), linoleum (23 %), PVC flooring (26 %)and polystyrene acoustic tile (27 %) but increases on carpets (55 % to 70 %), wall papers (65 % to 75 %), unpainted gypsum board (72 %) and pine wood board (77 %). Ozone deposition velocities on the tested products were calculated. When building products are exposed to ～100 ppb of ozone, their primary emissions are significantly modified and secondary emissions have been identified. In particular, increased emissions of formaldehyde,hexanal, heptanal, octanal and decanal have been measured during exposure to ozone of several of the tested products.