We spend 90% of our lives indoors, hence,more pollutions are trapped inside than outside. 

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There are many sources of indoor pollution. some of these pollutants include:

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Airborne particles, these particles are generated from dust, smoke, diesel exhaust, etc.

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Indoor formaldehyde, this is generated from furniture, cooking, building material, etc.

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Household odors & gas which are generated from painting, cooking and smoking.

 

ozone, this is developed from the outdoor air. 

 

Cardon Dioxide, from people exhaling and cooking.