AARST_Radon_Reporter_Q32022_FINAL

THE RADON REPORTER | 11 RESEARCH Foundation Measured multi- family buildings Only values above 5.4 pCi/L (200 Bq/ m 3 ) on floors above the ground floor Only values above 5.4 pCi/L (200 Bq/ m 3 ) on the ground floor Workplaces Higher floors with higher values All 326 17 % 64 % 1645 36 % Basement 169 20 % 58 % 404 28 % Basement (5 or more measurements on the ground floor) 63 16 % 60 % 888 26 % Slab on grade 124 7 % 71 % 194 20 % Foundation Measured workplace buildings Only values above 5.4 pCi/L (200 Bq/m 3 ) on floors above the ground floor Only values above 5.4 pCi/L (200 Bq/m 3 ) on the ground floor All 754 13 % 57 % Basement 209 17 % 56 % Slab on grade 194 7 % 63 % Foundation Values above 5.4 pCi/L (200 Bq/m 3 ) Average number of measured apartments on ground floor Average number of measured apartments on higher floors Basement Only on higher floors 4.3 10.6 Basement Only on ground floor 7.5 10.1 Slab on grade Only on higher floors 12.1 22.1 Slab on grade Only on ground floor 12.3 11.1 TABLE (4) RADON LEVELS ABOVE THE REFERENCE LEVELS ONLY ON SPECIFIC FLOORS IN SWEDISH MULTI-FAMILY BUILDINGS WITHOUT “BLUE CONCRETE” BUILDING MATERIAL. TABLE (5) RADON LEVELS ABOVE THE REFERENCE LEVELS ONLY ON SPECIFIC FLOORS IN SWEDISH WORKPLACES TABLE (6) NUMBER OF MEASURED APARTMENTS PER FLOOR IN SWEDISH MULTI-FAMILY BUILDINGS WHERE RADON LEVELS ABOVE THE REFERENCE LEVEL WAS FOUND. Some buildings had radon levels above the reference level for both the ground and higher floors, as can be seen in Table (4). Whether radon levels above the reference levels only on higher floors have some correlations to ventilation type and building year was also investigated. As can be seen in Table (7), buildings with natural ventilation more often have higher values only on higher floors. It is also found, as shown in Table (8), that only too high values on higher floors are more frequent in older buildings. These results are partly correlated since older houses more often have natural ventilation. In 55% of the houses built before 1960, the ventilation type was natural ventilation compared to 26 % in the whole data set. (continued) About 15-20% of Swedish multi-family houses, without the radon-emitting building material 'Blue Concrete,' with basements and with radon levels above the Swedish reference level of 200 Bq/m 3 (5.4 pCi/L), would not have been found if no measurements were made on floors above the ground floor. ” “