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rn Personal NO2 exposures and indoor and outdoor concentrations were measured for nearly 350 individuals in the Portage, WI, area. Concentrations in homes with gas stoves averaged 18 pg/m3 higher in the summer (median indoor/outdoor ratio 2.4) and 36 pg/m3 (median indoor/outdoor ratio 3.2) higher in the winter than outdoor levels. Personal exposures were closely related to indoor averages for households with gas stoves (r = 0.85 summer, r = 0.87 winter) and with electric stoves (r = 0.68 summer, r = 0.61 winter); more than 65% of the average day was spent a t home while about 15% was spent outdoors in summer and less than 5% in winter. The association between personal exposure and outdoor levels of NOz was weakest during the winter for both gas (r = 0.20) and electric (r = 0.28) stove groups. The measures of exposure and time allocation indicate that there is a wide range of variability in personal exposures to NO, that may not be adequately accounted for by simple stratifications based on cooking fuel type.

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