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Title: Comparative Risk Assessment Of Invented Gas Appliances
Author: H. Daniel, Irwin H. Billick, Donald O. Johnston
Source: American Gas Association 1984
Year Published: 1984
Abstract: The risks associated with pollutant emissions from unvented gas appliances can be estimated by integrating the health effects data on pollutants with the exposure data. The health effects data come from three types of studies (1) animal toxicology, (2) human clinical, and (3) epidemiology. Each of these studies has advantages and disadvantages, but epidemiology studies are preferable because they provide realworld data. The problem with many epidemiology studies is that they frequently contain confounding factors, such as smoking, and are of poor quality. Several efforts are now underway to collect better epidemiology data. Exposure data on unvented gas appliances can be either measured directly using personal monitors or indirectly by combining monitoring or modeling data on emissions with data on the periods of time individuals spend indoors. Direct measurements are, of course, preferable but it will take years before such data can be collected. In the interim, we must start collecting indoor air quality monitoring and modeling data and obtain data on individual activity patterns.

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