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Indoor concentrations of PM10, PM2.5, CO, and CO2 were measured in 25 naturally ventilated urban residences during the winter and summer seasons in Alexandria, Egypt. Ambient air samples were also collected simultaneously for comparison to indoor measurements. Furthermore, data for air exchange rates, home characteristics, and indoor activities during sampling were collected. It was found that the average indoor PM10, PM2.5, CO, and CO2 concentrations for all homes in winter were 119.4 ± 30.9 μg/m3, 85.2 ± 25.8 μg/m3, 1.6 ± 0.8 ppm, and