Abstract
Home indoor and outdoor levels, and personal exposures to NO 2 were determined for more than 500 subjects in a subpopulation of SAPALDIA by using passive samplers. The overall personal NO 2 average was found to be 27 μg m −3, the overall indoor average 21 μg m −3 and the overall outdoor average 31 μg m −3. Personal NO 2 levels ranged between the outdoor and indoor levels, with the exception of study areas with low NO 2 concentrations. In the winter, the indoor/outdoor ratios were lower than in the summer. Outdoor NO 2 levels were higher in winter. In some study areas, indoor NO 2 levels were lower in the winter than in the summer due to reduced ventilation but this was not consistent. Personal NO 2 concentrations were very similar during all seasons. Gas-cooking and smoking were important factors for elevated indoor and personal NO 2 levels (contribution: 5 μg m −3, 2 μg m −3, respectively). Personal exposure to NO 2 correlated best with the indoor NO 2 concentrations.
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