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
Always wear a dust mask to prevent dust inhalation. Extended periods of breathing in the dust will potentially cause lung problems. That being said if you breathe in too much dust from cleaning a dirty room you may begin to sneeze and/or cough which is your body's attempt to remove the dust.