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. 2022 Jan 1;61(1):161–167. doi: 10.1007/s00411-021-00956-0

Table 3.

Statistical results (arithmetic means (AMs) and geometric means (GMs) in Bq/m3) of radon and thoron measurements in 34 metropolitan areas across Canada

Metropolitan area Population* Results 222Rn 220Rn RTn
(CTn > DL) AM GM GSD AM GM GSD ETn/(ERn + ETn) (%)
Abbotsford-Mission 180,518 52 52 44 2.01 17 13 1.93 5.5
Barrie 197,059 44 63 54 1.81 16 13 1.88 4.5
Brantford 134,203 46 86 58 2.67 21 14 2.23 4.2
Calgary 1,392,609 35 104 90 1.81 11 10 1.70 1.9
Edmonton 1,321,426 46 102 83 1.95 14 12 1.84 2.5
Fredericton 58,220 17 79 51 2.32 203 86 3.19 31.8
Greater Sudbury 164,689 40 110 86 2.02 16 12 1.93 2.5
Guelph 151,984 43 79 63 1.87 14 11 1.86 3.0
Halifax–Dartmouth 495,691 79 123 60 3.09 29 19 2.37 4.1
Hamilton 747,545 45 71 59 1.82 16 12 1.93 3.9
Kelowna 194,882 45 125 92 2.36 16 13 1.96 2.3
Kingston 161,175 44 167 112 2.52 21 15 2.15 2.2
Kitchener–Cambridge–Waterloo 523,894 47 58 52 1.62 15 11 1.93 4.4
London 494,069 38 73 64 1.71 13 11 1.77 3.0
Moncton 144,810 48 71 50 2.29 14 11 1.88 3.4
Montréal 4,098,927 51 117 64 3.01 15 13 1.71 2.2
Oshawa 379,848 54 55 41 2.21 18 13 2.05 5.5
Ottawa—Gatineau 1,323,783 122 102 67 2.35 52 24 3.03 8.5
Peterborough 121,721 48 80 67 1.77 12 11 1.70 2.7
Québec 800,296 41 78 48 2.65 17 11 2.19 3.9
Regina 236,481 27 234 175 2.09 17 12 2.20 1.3
Saguenay 160,980 56 68 42 2.80 17 12 2.04 4.3
Saint John 126,202 62 103 57 2.89 19 13 2.25 3.3
Saskatoon 295,095 39 135 120 1.65 20 16 1.95 2.6
Sherbrooke 212,105 44 145 89 2.42 16 13 1.77 1.9
St. Catharines—Niagara 406,074 55 54 44 2.06 16 14 1.85 5.2
St. John's 205,955 45 70 55 2.10 12 11 1.74 3.1
Thunder Bay 121,621 41 139 83 3.36 19 14 2.05 2.4
Toronto 5,928,040 58 55 44 1.92 12 11 1.70 3.9
Trois-Rivières 156,042 65 42 36 1.84 14 11 1.84 5.8
Vancouver 2,463,431 58 25 21 1.86 12 10 1.67 7.6
Victoria 367,770 56 34 27 1.96 12 10 1.69 6.1
Windsor 329,144 39 115 95 1.89 22 15 2.17 3.4
Winnipeg 778,489 108 177 131 2.22 24 16 2.30 2.4
Canada 24,874,778 1738 84 60 2.20 17 13 1.89 4.0

DL detection limit, ETn effective dose from thoron (220Rn) exposure, ERn effective dose from radon (222Rn) exposure

*Populations are taken from Census 2016 population (Statistics Canada 2020)