The symptoms of ozone exposure are cough, shortness of breath, decrements in spirometric values, increases in airway resistance and bronchial responsiveness to stimuli, and airway inflammation with the potential to result in Emergency Department visits or hospital admissions, or mortality. ###>La portion centrale de l'acinus (unité fonctionnelle respiratoire incluant toutes les structures des bronchioles aux alvéoles) ou portion centriacinus est située autour de la bronchiole terminale.