“…Mucociliary clearance can be effected from environmental heat, moisture, partial oxygen pressure, pH, trauma, sulphur dioxide, formaldehyde, ozone, chlorine, smoking, viral infections, chronic sinusitis, chronic and allergic rhinitis, adenoid hypertrophy, cystic fibrosis, chronic bronchitis, septal deviation, surgery, bronchial asthma, and diabetes mellitus [6].…”