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The study of short-term effects of environmental ozone exposure on nasal airflow, lung function, and airway inflammation.Ninety one children—47 underwent rhinomanometry—were included. The study was carried out during the 2013 to 2014 academic year. Activity questionnaires and personal O3 samplers were distributed and 1 week later, respiratory measurements were performed. Daily measurements of outdoor ozone were also considered.A 10 μg/m3 increase in weekly personal ozone exposure concentrations was associated with a non-statistically significant 12.7% decrease in nasal inspiratory airflow (29.4% during the high ozone period). When the outdoor exposure of the same and the previous day were taken into account the corresponding figures were 13.48% and 43.58% (P = 0.02).There is an indication for increased risk of nasal obstruction during exposure to high ozone.