Table 3 Characteristics of flats by the main categories of the buildings.

From: Radon concentration in conventional and new energy efficient multi-storey apartment houses: results of survey in four Russian cities

Type of buildings

Average flat’s floor*

Average number of dwellers

Part of flats of no-smokers

Part of flats with reported permanent intentional ventilation

Brick 2–5 floor

3

2.3

0.73

0.24

Panel 5 floor

3

2.6

0.82

0.28

Panel 7–12 floor

5

2.7

0.83

0.37

Brick over 5 floors

6

2.2

0.63

0.33

Panel 1990-present

7

2.6

0.69

0.33

Energy efficient

11

2.7

0.76

0.28

  1. *Ground level is counted as the first floor.
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