Air pollution is obviously a serious problem in Hong Kong. The climate and lifestyle of the city affect the external environment just as much as the inside of our own homes. Many people focus on the visible outdoor pollution and do not consider the harmful compounds and gases that are being emitted by things such as the cleaning supplies we use and our house furnishings. An air purifier makes air more "breathable," and eliminates much of the bacteria, mold and VOCs (volatile organic compounds) that are present in the air.

Air purifiers help people with allergies and breathing problems. Have you noticed itchy eyes or worsening of the sinuses in you or your kids? You might not have had difficulties sleeping or breathing elsewhere, but have developed problems since moving to Hong Kong.

Some common products that emit VOCs are:

• Cleaning supplies
• Cosmetics
• Pesticides
• Carpeting
• Permanent markers
• Printers