Table 1.

Number of reported results, numbers (counts) of radon and thoron concentrations below detection limits, minimum and maximum measured radon and thoron concentrations in 34 metropolitan areas

Metropolitan area	Population*	Results reported	Counts CRn < DL	Counts CTn < DL	CRn min	CRn max	CTn min	CTn max
Abbotsford-Mission	180,518	90	1	38	< 3	466	< 4	136
Barrie	197,059	88	0	44	11	763	< 4	134
Brantford	134,203	89	2	43	< 3	472	< 4	110
Calgary	1,392,609	99	0	64	18	850	< 4	26
Edmonton	1,321,426	97	0	51	13	386	< 4	45
Fredericton	58,220	45	0	28	16	1374	< 4	1977
Greater Sudbury	164,689	96	0	56	18	748	< 4	103
Guelph	151,984	102	0	59	18	982	< 4	89
Halifax–Dartmouth	495,691	165	0	86	4	2341	< 4	206
Hamilton	747,545	87	0	42	18	397	< 4	180
Kelowna	194,882	108	1	63	< 3	1146	< 4	72
Kingston	161,175	97	0	53	12	703	< 4	146
Kitchener–Cambridge–Waterloo	523,894	102	0	55	21	211	< 4	172
London	494,069	81	0	43	15	340	< 4	43
Moncton	144,810	95	1	47	< 3	660	< 4	75
Montréal	4,098,927	99	1	48	< 3	772	< 4	48
Oshawa	379,848	96	1	42	< 3	322	< 4	110
Ottawa—Gatineau	1,323,783	204	0	82	8	1525	< 4	924
Peterborough	121,721	100	0	52	22	334	< 4	30
Québec	800,296	99	0	58	6	956	< 4	199
Regina	236,481	96	0	69	29	1335	< 4	78
Saguenay	160,980	100	1	44	< 3	700	< 4	197
Saint John	126,202	116	0	54	6	815	< 4	205
Saskatoon	295,095	104	0	65	43	460	< 4	86
Sherbrooke	212,105	104	0	60	19	1672	< 4	47
St. Catharines—Niagara	406,074	87	1	32	< 3	172	< 4	63
St. John’s	205,955	97	1	52	< 3	330	< 4	27
Thunder Bay	121,621	94	2	53	< 3	607	< 4	121
Toronto	5,928,040	91	0	33	7	182	< 4	56
Trois-Rivières	156,042	95	1	30	< 3	101	< 4	98
Vancouver	2,463,431	98	0	40	6	210	< 4	34
Victoria	367,770	102	0	46	4	174	< 4	44
Windsor	329,144	94	0	55	18	742	< 4	210
Winnipeg	778,489	217	0	109	20	1220	< 4	297
Total	24,874,778	3534	13	1796	< 3	2341	< 4	1977

DL detection limit, C_Rn concentration (in Bq/m³) for indoor radon gas, C_Tn concentration (in Bq/m³) for indoor thoron gas

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