peak expiratory flow meter icon. doodle hand drawn or outline icon style

air allergy asthma asthmatic background breath breathe breathing bronchial bronchitis bronchoconstriction control device doses equipment expiratory flow handheld health help hypersensitive ill illness illustration inhale inhaler inhaling isolated lung lungs measure medical medicine meter peak pef pefr plastic portable prescription protect pulmonary rate red respiratory row stack steroids system vector