• Avoid smoke, especially cigarette smoke, vapours and chemical fumes.

  • Stay indoors during the humid season or the change of seasons especially when the pollen count is high.

  • Do not use fans in closed and dusty places.

  • Cover mattresses and pillows with plastic covers. Wash the bedding in hot water every week.

  • Do not use a vaporiser or humidifier unless it is thoroughly cleaned.