WHO: "4.3 million people a year die from the exposure to household air pollution."

We spend most of time indoors.

Examples of indoor air pollutants:

• Cigarette smoke (400,000 deaths per year in U.S.)
• Formaldehyde
• Radon
• Wood smoke
• Pesticide
• Carbon monoxide

Q: What is important to control indoor air quality?

A: Identification, control of sources, filtration and ventilation.