Indoor radon concentration is investigated in the urban area of Tirana city, the capital of Albania. CR-39 Solid State Nuclear Track Detectors (SSNTDs) are used to survey 147 dwellings and 78 workplaces during 3-month measurements. In dwellings, the arithmetic mean and geometric mean value of radon concentration are found to be 97 and 71 Bq/m³, while in workplaces 131 and 98 Bq/m³, respectively. Radon concentration on the ground floor in dwellings is higher than that of other floors, while for workplaces no significant difference is found among floors. Radon concentrations in dwellings and workplaces are found to be higher than the reference level of 300 Bq/m³ for approximately 6% and 9% of cases, respectively. The results are spatially distributed using a grid of 1×1 km² realizing the indoor radon map showing the number of measurements and the arithmetic mean values. This information is used to assess the radiation health risk due to residential exposure to radon indoors.

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