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Table 1 Radon levels in homes throughout the world

From: Indoor radon exposure and lung cancer: a review of ecological studies

Country

Period[ref]

Area

No. of dwellings

222Rn (Bq/m3)

AM(SD)

GM(SD)

Median (Min, Max)

Excessive rate (%)

Recommended level

USA

1989–1990 [12, 42]

Nationwide (sample size)

5,694

1.25(0.12)

0.68(0.08)

-

6.0

4pCi/L (USA unit is pCi/L)

1991 [43]

Texas

2,890

1.0

0.5

0.6

3.6

2003–2004 [44]

Illinois

22,082

-

5.16(3.47)

3.6 (0.4, 178.9)

46.0

2010 [45]

Ohio

159,340

-

3.99

-(-, 927.6)

32.64

−2014 [46]

Kansas

73,959

5.1

-

-(-, 1,121.6)

42.6

−2014 [47]

New York

73,519

6.24

2.72(3.52)

-(-, 522.1)

-

−2015.6 [48]

Nevada

17,255

3.68

-

-

26.4

Canada

2007 [49]

Ottawa

93

110(168)

74(2.26)

-(8,1525)

12.0

200

2008 [50]

Winnipeg

116

143(101)

112(2.07)

-(20, 483)

20.0

2010 [51]

Fredericton

45

138(213)

82(2.56)

-(16, 1374)

18.0

2010 [51]

Halifax

64

259(475)

107(3.67)

-(4, 2341)

32.0

UK

1986–1987 [52]

Nationwide (sample size)

2,093

20.5

15(2.2)

-

0.5

200

−2009 [52]

England

465,000

99

53

-

11.3

−2009 [52]

Wales

16,800

91

51

-

10.7

−2008 [54]

Scotland

19,100

37

20

-(-, 4,600)

1.9

−2009 [55]

Northern Ireland

24,000

70

46

-(-, 4,900)

5.0

Denmark

1985–1986 [56]

Nationwide

496

47

29(2.2)

-

2.2

200

1995–1996 [57]

Nationwide

3,019

-

-

-(2, 590)

 

-[58]

Newly constructed

200

-

-

36.8 (9.0, 118)

7.0

100 (New homes)

Finland

1990–1991 [56]

Nationwide

3,074

123

84(2.1)

-

3.6 (Above 200 12.3)

400

−1996 [59, 60]

Nationwide

51,443

248

-

-(-, 32,700)

13.0 (Above 200 33.0)

Germany

1978–1984

Nationwide

7,500

50

40

-

1.5-2.5 (Above 200)

100

1991–1993 [56]

Hungary

1994–2006 [61]

Nationwide

6,154

174(139)

-

-(-, 1,841)

29.0

200

Ireland

1992–1999 [62]

Nationwide

11,319

89

57(2.40)

-(10, 1,924)

8.8

200

Japan

1993–1996 [63]

Nationwide

899

15.5(13.5)

12.7(1.78)

11.7 (-, 208)

-

-

-[64]

Hokkaido, Hiroshima, Kochi

6,645

21.3(18.8)

17.3(1.83)

16.4 (-)

0.4 (Above 148)

China

1984–1990 [65]

Nationwide

10,811

22.5

19.6

-

-

 

1994–1998 [66]

Shenyang

608

115.7

91.2(1.93)

122.4 (-)

17.4 (Above 148)

 

Gansu

2,394

222.9

176.2(2.08)

227.8

65.7 (Above 148)

 
  1. AM arithmetic mean, SD standard deviation, GM geometric mean, Min minimum, Max maximum