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 211 cities.

Updated August 30, 2026

Highest city

289.6Bq/m³

Chandler

Quebec city average

102.3Bq/m³

across 211 cities

Above action level

16/ 211

cities

Quebec Cities Ranked by Indoor Radon Levels
#	Location	Avg level	vs action level
1	Chandler	289.6 Bq/m³	1.4× over
2	Gaspe	279.4 Bq/m³	1.4× over
3	New-Richmond	251.9 Bq/m³	1.3× over
4	Thurso	238.4 Bq/m³	1.2× over
5	Plessisville	234.3 Bq/m³	1.2× over
6	Shawville	231.9 Bq/m³	1.2× over
7	Beauceville	229.4 Bq/m³	1.1× over
8	Sainte-Anne-des-Monts	228.8 Bq/m³	1.1× over
9	Deux-Montagnes	220.5 Bq/m³	1.1× over
10	Mont-Laurier	219.5 Bq/m³	1.1× over
11	Riviere-Rouge	216.6 Bq/m³	1.1× over
12	Labelle	213.9 Bq/m³	1.1× over
13	Fossambault-sur-lac	208.0 Bq/m³	1.0× over
14	Carleton-sur-Mer	203.4 Bq/m³	1.0× over
15	Bellechasse Regional County Municipality	202.9 Bq/m³	1.0× over
16	Maniwaki	201.5 Bq/m³	1.0× over
✓ Below EPA action level (200 Bq/m³)
17	Oka	189.7 Bq/m³	0.9× under
18	Beaconsfield	189.3 Bq/m³	0.9× under
19	Mont-Joli	189.2 Bq/m³	0.9× under
20	Coaticook	186.3 Bq/m³	0.9× under
21	Baie-D'Urfe	182.8 Bq/m³	0.9× under
22	Matane	178.6 Bq/m³	0.9× under
23	Saint-Eustache	177.9 Bq/m³	0.9× under
24	Cap-Sante	175.9 Bq/m³	0.9× under
25	Rimouski	174.5 Bq/m³	0.9× under
26	Donnacona	173.7 Bq/m³	0.9× under
27	Sutton	170.1 Bq/m³	0.9× under
28	Saint-Andre-Avellin	169.0 Bq/m³	0.8× under
29	Baie-Comeau	164.3 Bq/m³	0.8× under
30	Sherbrooke	164.1 Bq/m³	0.8× under
31	Lac-Megantic	163.8 Bq/m³	0.8× under
32	Montmagny	163.8 Bq/m³	0.8× under
33	Bromont	163.7 Bq/m³	0.8× under
34	Shannon	161.7 Bq/m³	0.8× under
35	Saint-Come--Liniere	159.2 Bq/m³	0.8× under
36	Wakefield	154.3 Bq/m³	0.8× under
37	Chateau-Richer	152.8 Bq/m³	0.8× under
38	Mirabel	150.1 Bq/m³	0.8× under
39	Adstock	146.9 Bq/m³	0.7× under
40	Varennes	146.3 Bq/m³	0.7× under
41	Waterloo	142.5 Bq/m³	0.7× under
42	Amqui	141.8 Bq/m³	0.7× under
43	Montreal-Est	141.1 Bq/m³	0.7× under
44	East Angus	140.7 Bq/m³	0.7× under
45	Chambly	140.6 Bq/m³	0.7× under
46	Sainte-Marthe-sur-le-Lac	137.7 Bq/m³	0.7× under
47	Granby	135.8 Bq/m³	0.7× under
48	Les Cedres	135.2 Bq/m³	0.7× under
49	L'Ile-Perrot	134.0 Bq/m³	0.7× under
50	Boisbriand	133.9 Bq/m³	0.7× under
51	Vercheres	133.8 Bq/m³	0.7× under
52	Pont-Rouge	132.0 Bq/m³	0.7× under
53	Roberval	131.1 Bq/m³	0.7× under
54	Neuville	130.4 Bq/m³	0.7× under
55	Saint-Basile-le-Grand	127.6 Bq/m³	0.6× under
56	Saint-Jean-sur-Richelieu	126.2 Bq/m³	0.6× under
57	Magog	125.7 Bq/m³	0.6× under
58	Ormstown	125.0 Bq/m³	0.6× under
59	Notre-Dame-de-l'Ile-Perrot	124.8 Bq/m³	0.6× under
60	Chateauguay	124.7 Bq/m³	0.6× under
61	Pincourt	124.5 Bq/m³	0.6× under
62	Vaudreuil-Dorion	123.5 Bq/m³	0.6× under
63	Cowansville	122.8 Bq/m³	0.6× under
64	Saint-Constant	122.2 Bq/m³	0.6× under
65	Cabano	121.4 Bq/m³	0.6× under
66	Sainte-Julie	121.0 Bq/m³	0.6× under
67	Saint-Cesaire	120.2 Bq/m³	0.6× under
68	La Pocatiere	119.8 Bq/m³	0.6× under
69	Levis	119.4 Bq/m³	0.6× under
70	Otterburn Park	118.0 Bq/m³	0.6× under
71	Saint-Denis-sur-Richelieu	117.0 Bq/m³	0.6× under
72	Richelieu	115.4 Bq/m³	0.6× under
73	Val-des-Monts	115.2 Bq/m³	0.6× under
74	Hudson	114.8 Bq/m³	0.6× under
75	Saint-Joseph-de-Beauce	114.5 Bq/m³	0.6× under
76	Princeville	113.5 Bq/m³	0.6× under
77	Rosemere	112.2 Bq/m³	0.6× under
78	Saint-Lambert-de-Lauzon	111.8 Bq/m³	0.6× under
79	Mercier	110.4 Bq/m³	0.6× under
80	Mont-Saint-Hilaire	110.4 Bq/m³	0.6× under
81	Delson	109.2 Bq/m³	0.5× under
82	Sainte-Martine	108.1 Bq/m³	0.5× under
83	Riviere-du-Loup	106.0 Bq/m³	0.5× under
84	Cookshire-Eaton	104.2 Bq/m³	0.5× under
85	Kirkland	103.9 Bq/m³	0.5× under
86	L'Ancienne-Lorette	103.9 Bq/m³	0.5× under
87	Laval	103.6 Bq/m³	0.5× under
88	Lachute	103.5 Bq/m³	0.5× under
89	Temiscaming	103.1 Bq/m³	0.5× under
90	Victoriaville	102.7 Bq/m³	0.5× under
91	Gatineau	101.4 Bq/m³	0.5× under
92	Saint-Hyacinthe	101.0 Bq/m³	0.5× under
93	Quebec	99.9 Bq/m³	0.5× under
94	Lac-Brome	99.3 Bq/m³	0.5× under
95	Saint-Antonin	98.8 Bq/m³	0.5× under
96	Sainte-Marie	98.7 Bq/m³	0.5× under
97	Repentigny	97.9 Bq/m³	0.5× under
98	Sainte Catherine de la Jacques Cartier	97.6 Bq/m³	0.5× under
99	Saint-Joseph-de-Coleraine	97.5 Bq/m³	0.5× under
100	Saint-Henri	96.7 Bq/m³	0.5× under
101	Valcourt	94.4 Bq/m³	0.5× under
102	Huntingdon	94.2 Bq/m³	0.5× under
103	Candiac	94.1 Bq/m³	0.5× under
104	Carignan	93.4 Bq/m³	0.5× under
105	Saint-Jerome	93.4 Bq/m³	0.5× under
106	Salaberry-de-Valleyfield	91.2 Bq/m³	0.5× under
107	Fort-Coulonge	90.2 Bq/m³	0.5× under
108	Marieville	90.2 Bq/m³	0.5× under
109	Sainte-Anne-de-Bellevue	89.7 Bq/m³	0.4× under
110	Beaupre	89.1 Bq/m³	0.4× under
111	Berthierville	88.7 Bq/m³	0.4× under
112	La Tuque	88.6 Bq/m³	0.4× under
113	Charlemagne	88.1 Bq/m³	0.4× under
114	Boucherville	87.9 Bq/m³	0.4× under
115	Cote-Saint-Luc	87.7 Bq/m³	0.4× under
116	Saint-Colomban	87.6 Bq/m³	0.4× under
117	Rigaud	87.1 Bq/m³	0.4× under
118	Bonaventure	87.0 Bq/m³	0.4× under
119	L'Assomption	86.8 Bq/m³	0.4× under
120	Bedford	86.5 Bq/m³	0.4× under
121	Saint-Damase	85.5 Bq/m³	0.4× under
122	Saint-Jacques	85.5 Bq/m³	0.4× under
123	Dollard-Des Ormeaux	83.6 Bq/m³	0.4× under
124	Sainte-Therese	82.4 Bq/m³	0.4× under
125	Mascouche	82.1 Bq/m³	0.4× under
126	Sainte-Thecle	81.7 Bq/m³	0.4× under
127	Richmond	78.1 Bq/m³	0.4× under
128	Bois-des-Filion	78.0 Bq/m³	0.4× under
129	Saint-Bruno-de-Montarville	76.9 Bq/m³	0.4× under
130	L'Epiphanie	76.8 Bq/m³	0.4× under
131	La Prairie	76.8 Bq/m³	0.4× under
132	Windsor	76.8 Bq/m³	0.4× under
133	Saint-Lazare	74.8 Bq/m³	0.4× under
134	Sept-Iles	74.1 Bq/m³	0.4× under
135	Baie-Saint-Paul	72.6 Bq/m³	0.4× under
136	Saint-Remi	72.2 Bq/m³	0.4× under
137	Les Coteaux	72.1 Bq/m³	0.4× under
138	Pointe-Claire	71.6 Bq/m³	0.4× under
139	Dorval	71.3 Bq/m³	0.4× under
140	Louiseville	70.6 Bq/m³	0.4× under
141	Papineauville	70.6 Bq/m³	0.4× under
142	Saint-Pie	70.5 Bq/m³	0.4× under
143	Saint-Leonard	70.2 Bq/m³	0.4× under
144	Longueuil	69.5 Bq/m³	0.3× under
145	Terrebonne	69.0 Bq/m³	0.3× under
146	Rougemont	68.7 Bq/m³	0.3× under
147	Lorraine	67.7 Bq/m³	0.3× under
148	Saint-Augustin-de-Desmaures	67.1 Bq/m³	0.3× under
149	Acton Vale	65.1 Bq/m³	0.3× under
150	La Malbaie	64.4 Bq/m³	0.3× under
151	Prevost	64.1 Bq/m³	0.3× under
152	Saint-Antoine-de-Tilly	64.0 Bq/m³	0.3× under
153	Asbestos	61.9 Bq/m³	0.3× under
154	Beauharnois	61.6 Bq/m³	0.3× under
155	Brossard	60.1 Bq/m³	0.3× under
156	Lavaltrie	59.9 Bq/m³	0.3× under
157	Sainte-Anne-des-Plaines	59.7 Bq/m³	0.3× under
158	Lacolle	57.9 Bq/m³	0.3× under
159	Contrecoeur	57.6 Bq/m³	0.3× under
160	Sorel-Tracy	56.9 Bq/m³	0.3× under
161	Blainville	56.5 Bq/m³	0.3× under
162	Saint-Laurent	56.5 Bq/m³	0.3× under
163	La Sarre	56.1 Bq/m³	0.3× under
164	Ferme-Neuve	55.8 Bq/m³	0.3× under
165	Montreal	55.6 Bq/m³	0.3× under
166	Saint-Lin-Laurentides	55.0 Bq/m³	0.3× under
167	Mont-Tremblant	54.9 Bq/m³	0.3× under
168	Saint-Felix-de-Valois	53.5 Bq/m³	0.3× under
169	Val-d'Or	53.2 Bq/m³	0.3× under
170	Saint-Marc-des-Carrieres	53.1 Bq/m³	0.3× under
171	Warwick	51.8 Bq/m³	0.3× under
172	Nicolet	50.9 Bq/m³	0.3× under
173	Saguenay	50.8 Bq/m³	0.3× under
174	Westmount	50.6 Bq/m³	0.3× under
175	Maskinonge	50.0 Bq/m³	0.3× under
176	Shawinigan	49.9 Bq/m³	0.2× under
177	Saint-Raymond	49.6 Bq/m³	0.2× under
178	Mont-Royal	49.5 Bq/m³	0.2× under
179	Crabtree	49.0 Bq/m³	0.2× under
180	Hampstead	46.4 Bq/m³	0.2× under
181	Kingsey Falls	46.3 Bq/m³	0.2× under
182	Saint-Tite	46.0 Bq/m³	0.2× under
183	Becancour	44.9 Bq/m³	0.2× under
184	Jonquiere	44.7 Bq/m³	0.2× under
185	Brownsburg-Chatham	44.4 Bq/m³	0.2× under
186	Rouyn-Noranda	44.1 Bq/m³	0.2× under
187	Breakeyville	43.9 Bq/m³	0.2× under
188	Montreal-Ouest	43.5 Bq/m³	0.2× under
189	Thetford-Mines	42.7 Bq/m³	0.2× under
190	Drummondville	42.0 Bq/m³	0.2× under
191	Napierville	41.9 Bq/m³	0.2× under
192	Rawdon	41.6 Bq/m³	0.2× under
193	Alma	41.3 Bq/m³	0.2× under
194	Sainte-Sophie	41.3 Bq/m³	0.2× under
195	Farnham	41.0 Bq/m³	0.2× under
196	Val-David	40.6 Bq/m³	0.2× under
197	Sainte-Agathe-des-Monts	40.1 Bq/m³	0.2× under
198	Saint-Germain-de-Grantham	40.0 Bq/m³	0.2× under
199	Pierreville	37.8 Bq/m³	0.2× under
200	Amos	36.9 Bq/m³	0.2× under
201	Notre-Dame-des-Prairies	33.8 Bq/m³	0.2× under
202	Saint-Sauveur	32.9 Bq/m³	0.2× under
203	Ville-Marie	31.7 Bq/m³	0.2× under
204	Joliette	31.4 Bq/m³	0.2× under
205	Sainte-Catherine	29.4 Bq/m³	0.1× under
206	Trois-Rivieres	29.4 Bq/m³	0.1× under
207	Sainte-Julienne	28.7 Bq/m³	0.1× under
208	Saint-Gabriel	24.2 Bq/m³	0.1× under
209	Saint-Cyrille-de-Wendover	23.7 Bq/m³	0.1× under
210	Sainte-Adele	23.4 Bq/m³	0.1× under
211	Daveluyville	18.1 Bq/m³	0.1× under

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