Quebec Cities Ranked by Indoor Radon Levels

Measured averages from Airthings devices across Quebec, Canada. Action level: 200 Bq/m³ — the threshold at which remediation is recommended.

Chandler has the highest measured indoor radon in Quebec at 289.6 Bq/m³, based on Airthings measurements across 207 cities.

Updated August 16, 2026

Highest city

289.6Bq/m³

Chandler

Quebec city average

102.9Bq/m³

across 207 cities

Above action level

16/ 207

cities

Quebec Cities Ranked by Indoor Radon Levels
#	Location	Avg level	Monitors	vs action level
1	Chandler	289.6 Bq/m³	7	1.4× over
2	Gaspe	279.4 Bq/m³	25	1.4× over
3	New-Richmond	251.9 Bq/m³	14	1.3× over
4	Thurso	238.4 Bq/m³	6	1.2× over
5	Plessisville	234.3 Bq/m³	11	1.2× over
6	Beauceville	233.9 Bq/m³	54	1.2× over
7	Shawville	231.9 Bq/m³	15	1.2× over
8	Sainte-Anne-des-Monts	228.8 Bq/m³	10	1.1× over
9	Deux-Montagnes	220.5 Bq/m³	146	1.1× over
10	Mont-Laurier	219.5 Bq/m³	18	1.1× over
11	Riviere-Rouge	216.6 Bq/m³	14	1.1× over
12	Labelle	213.9 Bq/m³	6	1.1× over
13	Fossambault-sur-lac	208.0 Bq/m³	9	1.0× over
14	Carleton-sur-Mer	203.4 Bq/m³	14	1.0× over
15	Bellechasse Regional County Municipality	202.9 Bq/m³	16	1.0× over
16	Maniwaki	201.5 Bq/m³	9	1.0× over
✓ Below EPA action level (200 Bq/m³)
17	Oka	189.7 Bq/m³	31	0.9× under
18	Beaconsfield	189.3 Bq/m³	138	0.9× under
19	Mont-Joli	189.2 Bq/m³	21	0.9× under
20	Coaticook	186.3 Bq/m³	21	0.9× under
21	Baie-D'Urfe	182.8 Bq/m³	59	0.9× under
22	Matane	178.6 Bq/m³	13	0.9× under
23	Saint-Eustache	177.9 Bq/m³	97	0.9× under
24	Cap-Sante	175.9 Bq/m³	23	0.9× under
25	Rimouski	174.5 Bq/m³	93	0.9× under
26	Donnacona	173.7 Bq/m³	6	0.9× under
27	Baie-Comeau	170.4 Bq/m³	14	0.9× under
28	Sutton	170.1 Bq/m³	12	0.9× under
29	Saint-Andre-Avellin	169.0 Bq/m³	18	0.8× under
30	Sherbrooke	164.1 Bq/m³	417	0.8× under
31	Lac-Megantic	163.8 Bq/m³	19	0.8× under
32	Montmagny	163.8 Bq/m³	56	0.8× under
33	Bromont	162.4 Bq/m³	76	0.8× under
34	Shannon	161.7 Bq/m³	111	0.8× under
35	Saint-Come--Liniere	159.2 Bq/m³	25	0.8× under
36	Wakefield	154.3 Bq/m³	116	0.8× under
37	Chateau-Richer	152.8 Bq/m³	48	0.8× under
38	Mirabel	151.4 Bq/m³	55	0.8× under
39	Adstock	146.9 Bq/m³	12	0.7× under
40	Varennes	146.3 Bq/m³	61	0.7× under
41	Waterloo	142.7 Bq/m³	52	0.7× under
42	Amqui	141.8 Bq/m³	11	0.7× under
43	Montreal-Est	141.1 Bq/m³	106	0.7× under
44	East Angus	140.7 Bq/m³	16	0.7× under
45	Chambly	140.6 Bq/m³	19	0.7× under
46	Sainte-Marthe-sur-le-Lac	138.2 Bq/m³	92	0.7× under
47	Granby	135.8 Bq/m³	149	0.7× under
48	Les Cedres	135.2 Bq/m³	22	0.7× under
49	L'Ile-Perrot	134.0 Bq/m³	38	0.7× under
50	Boisbriand	133.9 Bq/m³	117	0.7× under
51	Vercheres	133.8 Bq/m³	24	0.7× under
52	Pont-Rouge	132.0 Bq/m³	30	0.7× under
53	Roberval	131.1 Bq/m³	8	0.7× under
54	Neuville	130.4 Bq/m³	17	0.7× under
55	Saint-Basile-le-Grand	127.6 Bq/m³	104	0.6× under
56	Saint-Jean-sur-Richelieu	126.9 Bq/m³	168	0.6× under
57	Magog	125.7 Bq/m³	133	0.6× under
58	Ormstown	125.0 Bq/m³	22	0.6× under
59	Notre-Dame-de-l'Ile-Perrot	124.8 Bq/m³	30	0.6× under
60	Chateauguay	124.7 Bq/m³	44	0.6× under
61	Pincourt	124.5 Bq/m³	58	0.6× under
62	Vaudreuil-Dorion	123.5 Bq/m³	98	0.6× under
63	Cowansville	122.8 Bq/m³	41	0.6× under
64	Saint-Constant	122.8 Bq/m³	109	0.6× under
65	Cabano	121.4 Bq/m³	14	0.6× under
66	Levis	121.1 Bq/m³	151	0.6× under
67	Sainte-Julie	121.0 Bq/m³	117	0.6× under
68	La Pocatiere	119.8 Bq/m³	38	0.6× under
69	Otterburn Park	118.0 Bq/m³	65	0.6× under
70	Saint-Denis-sur-Richelieu	115.9 Bq/m³	18	0.6× under
71	Richelieu	115.4 Bq/m³	19	0.6× under
72	Val-des-Monts	115.2 Bq/m³	65	0.6× under
73	Hudson	114.8 Bq/m³	47	0.6× under
74	Saint-Joseph-de-Beauce	114.5 Bq/m³	10	0.6× under
75	Princeville	113.5 Bq/m³	6	0.6× under
76	Rosemere	112.2 Bq/m³	153	0.6× under
77	Saint-Lambert-de-Lauzon	111.8 Bq/m³	23	0.6× under
78	Mercier	110.4 Bq/m³	49	0.6× under
79	Mont-Saint-Hilaire	110.4 Bq/m³	295	0.6× under
80	Delson	109.2 Bq/m³	30	0.5× under
81	Sainte-Martine	108.1 Bq/m³	12	0.5× under
82	Riviere-du-Loup	106.0 Bq/m³	37	0.5× under
83	Cookshire-Eaton	104.2 Bq/m³	9	0.5× under
84	Kirkland	103.9 Bq/m³	181	0.5× under
85	L'Ancienne-Lorette	103.9 Bq/m³	504	0.5× under
86	Laval	103.6 Bq/m³	542	0.5× under
87	Lachute	103.5 Bq/m³	25	0.5× under
88	Victoriaville	102.9 Bq/m³	48	0.5× under
89	Gatineau	101.4 Bq/m³	752	0.5× under
90	Saint-Hyacinthe	101.0 Bq/m³	70	0.5× under
91	Quebec	99.5 Bq/m³	788	0.5× under
92	Lac-Brome	99.3 Bq/m³	20	0.5× under
93	Saint-Antonin	98.8 Bq/m³	21	0.5× under
94	Sainte-Marie	98.7 Bq/m³	25	0.5× under
95	Repentigny	97.9 Bq/m³	116	0.5× under
96	Sainte Catherine de la Jacques Cartier	97.6 Bq/m³	26	0.5× under
97	Saint-Joseph-de-Coleraine	97.5 Bq/m³	20	0.5× under
98	Saint-Henri	96.7 Bq/m³	35	0.5× under
99	Valcourt	94.4 Bq/m³	10	0.5× under
100	Huntingdon	94.2 Bq/m³	6	0.5× under
101	Candiac	94.1 Bq/m³	105	0.5× under
102	Saint-Jerome	93.9 Bq/m³	108	0.5× under
103	Carignan	93.4 Bq/m³	135	0.5× under
104	Salaberry-de-Valleyfield	91.2 Bq/m³	40	0.5× under
105	Fort-Coulonge	90.2 Bq/m³	12	0.5× under
106	Marieville	90.2 Bq/m³	23	0.5× under
107	Sainte-Anne-de-Bellevue	89.7 Bq/m³	25	0.4× under
108	Berthierville	88.7 Bq/m³	7	0.4× under
109	La Tuque	88.6 Bq/m³	6	0.4× under
110	Charlemagne	88.1 Bq/m³	33	0.4× under
111	Boucherville	87.9 Bq/m³	217	0.4× under
112	Cote-Saint-Luc	87.7 Bq/m³	53	0.4× under
113	Saint-Colomban	87.6 Bq/m³	56	0.4× under
114	Rigaud	87.1 Bq/m³	27	0.4× under
115	Bonaventure	87.0 Bq/m³	6	0.4× under
116	L'Assomption	86.8 Bq/m³	34	0.4× under
117	Bedford	86.5 Bq/m³	17	0.4× under
118	Saint-Damase	85.5 Bq/m³	7	0.4× under
119	Saint-Jacques	85.5 Bq/m³	11	0.4× under
120	Dollard-Des Ormeaux	83.7 Bq/m³	268	0.4× under
121	Beaupre	83.0 Bq/m³	32	0.4× under
122	Sainte-Therese	82.4 Bq/m³	62	0.4× under
123	Mascouche	82.1 Bq/m³	69	0.4× under
124	Sainte-Thecle	81.7 Bq/m³	6	0.4× under
125	Richmond	78.1 Bq/m³	7	0.4× under
126	Bois-des-Filion	78.0 Bq/m³	68	0.4× under
127	Saint-Bruno-de-Montarville	77.0 Bq/m³	142	0.4× under
128	L'Epiphanie	76.8 Bq/m³	9	0.4× under
129	La Prairie	76.8 Bq/m³	93	0.4× under
130	Windsor	76.8 Bq/m³	22	0.4× under
131	Saint-Lazare	74.8 Bq/m³	80	0.4× under
132	Sept-Iles	74.1 Bq/m³	21	0.4× under
133	Baie-Saint-Paul	72.6 Bq/m³	10	0.4× under
134	Saint-Remi	72.2 Bq/m³	23	0.4× under
135	Les Coteaux	72.1 Bq/m³	44	0.4× under
136	Dorval	71.9 Bq/m³	68	0.4× under
137	Louiseville	70.6 Bq/m³	8	0.4× under
138	Papineauville	70.6 Bq/m³	11	0.4× under
139	Saint-Pie	70.5 Bq/m³	11	0.4× under
140	Saint-Leonard	70.2 Bq/m³	248	0.4× under
141	Pointe-Claire	69.6 Bq/m³	95	0.3× under
142	Longueuil	69.4 Bq/m³	191	0.3× under
143	Terrebonne	69.0 Bq/m³	131	0.3× under
144	Rougemont	68.7 Bq/m³	6	0.3× under
145	Lorraine	67.7 Bq/m³	44	0.3× under
146	Saint-Augustin-de-Desmaures	67.1 Bq/m³	55	0.3× under
147	Acton Vale	65.1 Bq/m³	15	0.3× under
148	La Malbaie	64.4 Bq/m³	7	0.3× under
149	Prevost	64.1 Bq/m³	58	0.3× under
150	Saint-Antoine-de-Tilly	64.0 Bq/m³	19	0.3× under
151	Asbestos	61.9 Bq/m³	7	0.3× under
152	Beauharnois	61.6 Bq/m³	19	0.3× under
153	Brossard	60.1 Bq/m³	477	0.3× under
154	Lavaltrie	59.9 Bq/m³	28	0.3× under
155	Sainte-Anne-des-Plaines	59.7 Bq/m³	22	0.3× under
156	Lacolle	57.9 Bq/m³	13	0.3× under
157	Contrecoeur	57.6 Bq/m³	12	0.3× under
158	Sorel-Tracy	56.9 Bq/m³	34	0.3× under
159	Blainville	56.5 Bq/m³	137	0.3× under
160	Saint-Laurent	56.5 Bq/m³	90	0.3× under
161	La Sarre	56.1 Bq/m³	6	0.3× under
162	Ferme-Neuve	55.8 Bq/m³	6	0.3× under
163	Montreal	55.6 Bq/m³	760	0.3× under
164	Saint-Lin-Laurentides	55.0 Bq/m³	26	0.3× under
165	Mont-Tremblant	54.9 Bq/m³	30	0.3× under
166	Saint-Felix-de-Valois	53.5 Bq/m³	14	0.3× under
167	Val-d'Or	53.2 Bq/m³	21	0.3× under
168	Saint-Marc-des-Carrieres	53.1 Bq/m³	11	0.3× under
169	Warwick	51.8 Bq/m³	8	0.3× under
170	Nicolet	50.9 Bq/m³	16	0.3× under
171	Saguenay	50.8 Bq/m³	91	0.3× under
172	Westmount	50.6 Bq/m³	149	0.3× under
173	Maskinonge	50.0 Bq/m³	9	0.3× under
174	Shawinigan	49.9 Bq/m³	64	0.2× under
175	Saint-Raymond	49.6 Bq/m³	137	0.2× under
176	Mont-Royal	49.5 Bq/m³	151	0.2× under
177	Crabtree	49.0 Bq/m³	9	0.2× under
178	Hampstead	46.4 Bq/m³	25	0.2× under
179	Kingsey Falls	46.3 Bq/m³	7	0.2× under
180	Becancour	44.9 Bq/m³	26	0.2× under
181	Jonquiere	44.7 Bq/m³	29	0.2× under
182	Brownsburg-Chatham	44.4 Bq/m³	8	0.2× under
183	Rouyn-Noranda	44.1 Bq/m³	33	0.2× under
184	Breakeyville	43.9 Bq/m³	88	0.2× under
185	Montreal-Ouest	43.5 Bq/m³	76	0.2× under
186	Thetford-Mines	42.7 Bq/m³	20	0.2× under
187	Drummondville	42.0 Bq/m³	68	0.2× under
188	Napierville	41.9 Bq/m³	10	0.2× under
189	Rawdon	41.6 Bq/m³	38	0.2× under
190	Alma	41.3 Bq/m³	28	0.2× under
191	Sainte-Sophie	41.3 Bq/m³	28	0.2× under
192	Farnham	41.0 Bq/m³	25	0.2× under
193	Val-David	40.6 Bq/m³	26	0.2× under
194	Sainte-Agathe-des-Monts	40.1 Bq/m³	37	0.2× under
195	Saint-Germain-de-Grantham	40.0 Bq/m³	14	0.2× under
196	Pierreville	37.8 Bq/m³	9	0.2× under
197	Amos	36.9 Bq/m³	11	0.2× under
198	Ville-Marie	34.2 Bq/m³	7	0.2× under
199	Notre-Dame-des-Prairies	33.8 Bq/m³	19	0.2× under
200	Saint-Sauveur	32.9 Bq/m³	40	0.2× under
201	Joliette	31.4 Bq/m³	24	0.2× under
202	Sainte-Catherine	29.6 Bq/m³	38	0.1× under
203	Trois-Rivieres	29.4 Bq/m³	103	0.1× under
204	Sainte-Julienne	28.7 Bq/m³	20	0.1× under
205	Saint-Cyrille-de-Wendover	23.7 Bq/m³	9	0.1× under
206	Sainte-Adele	23.4 Bq/m³	33	0.1× under
207	Daveluyville	18.1 Bq/m³	8	0.1× under

See Canada cities ranked by radon level See all Provinces ranked by radon level