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
Many breathing problems are chronic or long-term. These common breathing problems include chronic sinusitis, COPD, allergies and asthma. These problems can cause a host of symptoms such as nasal congestion, runny nose, itchy or watery eyes, chest congestion, coughing, wheezing, laboured breathing and shallow breathing. The nasal passage is a pathway for viruses and allergens to enter your lungs.