Notes: Due to the characteristics of the limestone used as the main construction material in Cuba (which contributes very low amounts of radon), as well as the climatological characteristics of the tropical zone, where the houses remain very ventilated throughout the year, the reported measurements of radon concentration in dwellings is very low. The studies carried out provided the following results:
La Habana (Western region): 9.66 +- 0.04  Bq/m3           243.0 μSv/year
Camagüey (Central Region): 4.79  +- 0.04  Bq/m3           121.0 μSv/year
Holguín (Eastern Region):      5.90 +- 0.05   Bq/m3          148.7 μSv/year  