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
Some types of air pollution are as follows. Smog: The first type of the air pollution is the smog. It is defined as when the smoke present in the atmosphere after emitting from different sources is combined with the fog present in the air, a mixture formed that is referred to as smog.ypes Of Air Pollution. Air pollution is one of the major problems of the present world. There are so many causes that can pollute the air completely and spread different types of dangerous diseases. On the basis of the different causes of air pollution it can be distinguished into different types.