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Abstract
As part of a larger program to investigate indoor sources of air pollution, an indoor/outdoor sampling program was carried out for NO, NO2, and CO In four private houses which had gas stoves. The four houses chosen for study represented different surrounding land use, life styles, and house age and layout. The pollutant gases were measured essentially simultaneously at three indoor locations and one outdoor location. The results of the program showed that indoor levels of NO and NO2 are directly related to stove use in the homes tested. Furthermore, these stoves often produced more NO2 than NO. In some instances, the levels of NO2 and CO in the kitchen exceeded the air quality standards for these pollutants if such outdoor standards were to be applied to indoors and the data for the sampling periods were typical of an entire year. A diffusion experiment conducted in one of the houses showed that the half-life for NO2 was less than one-third that for either NO or CO. Oxidation of NO to NO2 (based upon comparing the half-life of NO to CO) does not appear to occur to a significant degree indoors.