Sources of air pollutants are found in indoor and outdoor environment. Indoor air pollution levels are typically 2-5 times higher than outdoor pollution levels while 90% of our lives spent indoors. These pollutants are likely to cause or exacerbate health problems. The common indoor air pollutants;

• Airbourne particles - from diesel exhaust, dust, smoke and other sources.
• Indoor formaldehyde - from building materials, furnitures, cooking and smoking.
• Household odors and gases - from activities such as painting, cooking and smoking.
• Ozone - from outdoor air (ground level of ozone is harmful to breathe).
• Carbondioxide - from people exhaling and cooking.