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STATISTICAL COMPARISON OF RESULTS OF TWO INDOOR AIR PILOT STUDIES
Citation:
Mack, G., J. Stockrahm, AND J. Chuang. STATISTICAL COMPARISON OF RESULTS OF TWO INDOOR AIR PILOT STUDIES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/3-89/055.
Description:
The objective of this study was to compare the results between two previous indoor air PAH monitoring studies conducted by EPA in 1984 and 1987. Both of the previous studies were pilot studies involving ambient and indoor air monitoring at a small number of residences in Columbus, Ohio. The objectives of these studies were to characterize the ranges of selected PAN and nitrogen heterocyclic compounds in the indoor air and to evaluate contributions of various indoor combustion sources to the indoor PAHN concentration levels. This current study compared the results between the 1984 and 1987 studies, and where the results were consistent, the data from the two studies were combined to produce more precise statistical estimates of concentration level ranges and estimates of the contributions of different indoor combustion sources to indoor PAH levels. Results between the two studies were found to be consistent for all compounds except quinoline and isoquinoline. Excessive breakthrough in the PUF vapor traps used in the 1984 study resulted in lower measured concentration levels than those measured for the 1987 study using an XAD-4 resin vapor trap. The combined study data showed that cigarette smoking and gas heating systems were the two biggest contributors to indoor PAH concentration levels.