An overview of the indoor air quality problem.

This overview explains why indoor air quality (lAQ) has recently attracted so much attention what are the major sources of indoor air pollution, and what are the health effects of concern. It discusses differences among occupational, outdoor, and indoor air pollution problems including some of the different measurement needs. It also covers the total exposure concept, and discusses the California IAQ Program. Emerging trends in indoor air quality measurement techniques are presented in the final part of the paper.