What are the most common indoor pollutants?

The most common indoor pollutants are as follows:

• Lead 
• Nitrogen Dioxide 
• Pesticides.
• Radon 
• Secondhand Smoke/Environmental Tobacco Smoke.
• Volatile Organic Compounds

Other sources such as tobacco smoke, wood-burning stoves and construction materials such as asbestos also cause indoor air pollution.

For more relevant articles refer to the links given below:

• UPSC Environment and Ecology Questions
• Conservation of Biodiversity
• UPSC Environment and Ecology