Indoor air pollution in Rotterdam homes.

Reports study of 800 paired samples of indoor and outdoor smoke and SO2 concentrations of 60 Rotterdam homes. Finds that smoking increased the amount of smoke found in living rooms and the data suggest that newer houses tend to have less SO2 in the living rooms than older houses. On average living rooms contained approximately 80% of the smoke and 20% of the SO2 measured simultaneously outdoors during 24 hour periods. Estimates probability of having more SO2 in the living room than outdoors is less than 2%.