There are three basic strategies to improve indoor air quality
- Source Control
- Improved Ventilation, and
- Air cleaners
Usually the most effective way to improve indoor air quality is to eliminate individual sources of pollution or to reduce their emissions. Some sources, like those that contain asbestos, can be sealed or enclosed; others, like gas stoves, can be adjusted to decrease the amount of emissions. In many cases, source control is also a more cost-efficient approach to protecting indoor air quality than increasing ventilation because increasing ventilation can increase energy costs.
Read the entire post at http://www.epa.gov/iaq/is-imprv.html