Acute respiratory effects of low level summer smog in primary school children.
We aimed to study the possible effects of exposure to a summer smog episode on the respiratory health of 212 school children.
Furthermore, the suitability of the forced oscillation technique (FOT) to demonstrate such effects was evaluated.
Acute respiratory symptoms were evaluated by questionnaire and lung function was assessed by spirometry and respiratory impedance measurements.
For each child, comparisons were made between measurements performed at baseline (low levels of air pollutant : 55 mug. m-3 for SO2 and 58 mug. m-3 for NO2 (maximum 24 h means) ; O3 levels ranged from 2-56 mug. m-3 (8 h mean)) ; and after a summer smog episode (characterized by 8 h O3 levels>120 mug. m-3 (163 mug. m-3) and 1 h levels>160 mug. m-3 (215 mug. m-3).
No significant effects were observed on the prevalence of acute respiratory symptoms.
When individual changes in lung function indices (deltaLF) were regressed on changes in previous day ozone (8 h mean) and changes in mean daily temperature (AMTemp), using multiple linear regression analysis, a significant negative association was observed with peak expiratory flow (PEF), but not with other spirometry indices.
In conclusion, in this study short-term exposure to moderately high levels of ozone did not result in clear adverse effects on the respiratory health of the children Further research into the applicability of the FOT in this type of field studies still seems to be advisable.
Mots-clés Pascal : Pollution air, Ozone, Volume pulmonaire, Oscillation forcée, Technique, Symptomatologie, Exploration, Résultat, Enfant, Homme, Appareil respiratoire pathologie
Mots-clés Pascal anglais : Air pollution, Ozone, Lung volume, Forced oscillation, Technique, Symptomatology, Exploration, Result, Child, Human, Respiratory disease
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 95-0409619
Code Inist : 002B30A02A. Création : 01/03/1996.