In order to evaluate the pulmonary function changes in Egyptian school children who were exposed to environmental smoking and in order to show if parental smoking was associated with a significant enhancement of allergic sensitization in children of smoking parents >150 Egyptian school children without any chest troubles were studied. They were 130 passive smoker children, 88 boys and 42 girls. Their ages ranged from 9 -12 years. Mother 20 children without history of exposure to parental smoking of comparable age and sex were studied and served as controls. Passive smoker children had highly significant increase in serum total IgE than control children. This increase was more in females than males and in rural than urban children. There was no statistical significant difference as regards the eosinophilic count between passive smokers and the control. Passive smoker children had statistically significant decrease in pulmonary functions as regards FEV1%, PEF% and MVV% in comparison to the control. The decrements in pulmonary functions were
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