Definition: Sibilance is a sound characterized by pronouncing words with the letter 's'. In audio reproduction the letter 's' should sound clear and distinct, not smeared or distorted as in 'sh'.
High air pollution levels can cause immediate health problems including: Aggravated cardiovascular and respiratory illness; Added stress to heart and lungs, which must work harder to supply the body with oxygen; Damaged cells in the respiratory system
abnormal breath sound caused by a LOWER AIRWAY obstruction-heard on expiration-high pitched musical whistling, only audible with stethoscope-air moving through narrowed bronchioles-usually bronchopasm-may indicate sign of pulmonary edema-sound of asthma, croup hayfever or bronchitis.