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 September 28, 2026

Highest city

289.6Bq/m³

Chandler

Quebec city average

102.0Bq/m³

across 211 cities

Above action level

14/ 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	282.5 Bq/m³	1.4× over
3	Shawville	281.7 Bq/m³	1.4× over
4	Thurso	238.4 Bq/m³	1.2× over
5	Plessisville	234.3 Bq/m³	1.2× over
6	Sainte-Anne-des-Monts	228.8 Bq/m³	1.1× over
7	Beauceville	226.1 Bq/m³	1.1× over
8	New-Richmond	220.5 Bq/m³	1.1× over
9	Deux-Montagnes	219.6 Bq/m³	1.1× over
10	Riviere-Rouge	216.6 Bq/m³	1.1× over
11	Mont-Laurier	215.9 Bq/m³	1.1× over
12	Carleton-sur-Mer	209.5 Bq/m³	1.0× over
13	Fossambault-sur-lac	208.0 Bq/m³	1.0× over
14	Maniwaki	202.5 Bq/m³	1.0× over
✓ Below EPA action level (200 Bq/m³)
15	Mont-Joli	198.4 Bq/m³	1.0× under
16	Bellechasse Regional County Municipality	195.0 Bq/m³	1.0× under
17	Beaconsfield	190.4 Bq/m³	1.0× under
18	Coaticook	186.1 Bq/m³	0.9× under
19	Oka	185.9 Bq/m³	0.9× under
20	Labelle	180.1 Bq/m³	0.9× under
21	Matane	178.6 Bq/m³	0.9× under
22	Baie-D'Urfe	178.5 Bq/m³	0.9× under
23	Rimouski	177.4 Bq/m³	0.9× under
24	Saint-Eustache	174.8 Bq/m³	0.9× under
25	Cap-Sante	172.1 Bq/m³	0.9× under
26	Saint-Andre-Avellin	169.0 Bq/m³	0.8× under
27	Montmagny	167.6 Bq/m³	0.8× under
28	Sutton	166.7 Bq/m³	0.8× under
29	Lac-Megantic	161.5 Bq/m³	0.8× under
30	Sherbrooke	161.1 Bq/m³	0.8× under
31	Baie-Comeau	159.8 Bq/m³	0.8× under
32	Bromont	158.1 Bq/m³	0.8× under
33	Shannon	157.8 Bq/m³	0.8× under
34	Saint-Come--Liniere	156.9 Bq/m³	0.8× under
35	Wakefield	155.4 Bq/m³	0.8× under
36	Donnacona	152.8 Bq/m³	0.8× under
37	Mirabel	150.7 Bq/m³	0.8× under
38	Chateau-Richer	146.9 Bq/m³	0.7× under
39	Adstock	146.4 Bq/m³	0.7× under
40	Chambly	145.1 Bq/m³	0.7× under
41	Varennes	142.7 Bq/m³	0.7× under
42	Amqui	141.8 Bq/m³	0.7× under
43	East Angus	140.7 Bq/m³	0.7× under
44	Waterloo	139.6 Bq/m³	0.7× under
45	Montreal-Est	137.5 Bq/m³	0.7× under
46	Sainte-Marthe-sur-le-Lac	135.4 Bq/m³	0.7× under
47	Les Cedres	135.2 Bq/m³	0.7× under
48	Granby	134.4 Bq/m³	0.7× under
49	Boisbriand	133.1 Bq/m³	0.7× under
50	L'Ile-Perrot	132.0 Bq/m³	0.7× under
51	Roberval	131.1 Bq/m³	0.7× under
52	Neuville	130.4 Bq/m³	0.7× under
53	Saint-Basile-le-Grand	129.9 Bq/m³	0.6× under
54	Vercheres	126.1 Bq/m³	0.6× under
55	Chateauguay	125.1 Bq/m³	0.6× under
56	Ormstown	125.0 Bq/m³	0.6× under
57	Otterburn Park	124.7 Bq/m³	0.6× under
58	Pont-Rouge	124.7 Bq/m³	0.6× under
59	Saint-Jean-sur-Richelieu	124.5 Bq/m³	0.6× under
60	Vaudreuil-Dorion	122.8 Bq/m³	0.6× under
61	Magog	122.7 Bq/m³	0.6× under
62	Pincourt	122.3 Bq/m³	0.6× under
63	Notre-Dame-de-l'Ile-Perrot	121.5 Bq/m³	0.6× under
64	Saint-Constant	121.5 Bq/m³	0.6× under
65	Cabano	121.4 Bq/m³	0.6× under
66	Saint-Cesaire	120.2 Bq/m³	0.6× under
67	La Pocatiere	119.6 Bq/m³	0.6× under
68	Cowansville	119.5 Bq/m³	0.6× under
69	Sainte-Julie	117.8 Bq/m³	0.6× under
70	Levis	117.5 Bq/m³	0.6× under
71	Saint-Denis-sur-Richelieu	117.0 Bq/m³	0.6× under
72	Val-des-Monts	116.9 Bq/m³	0.6× under
73	Richelieu	115.4 Bq/m³	0.6× under
74	Hudson	113.9 Bq/m³	0.6× under
75	Rosemere	111.4 Bq/m³	0.6× under
76	Delson	110.5 Bq/m³	0.6× under
77	Mont-Saint-Hilaire	110.3 Bq/m³	0.6× under
78	Lac-Brome	108.9 Bq/m³	0.5× under
79	Saint-Hyacinthe	108.3 Bq/m³	0.5× under
80	Sainte-Martine	108.1 Bq/m³	0.5× under
81	Saint-Joseph-de-Beauce	107.7 Bq/m³	0.5× under
82	Saint-Henri	107.4 Bq/m³	0.5× under
83	Riviere-du-Loup	107.1 Bq/m³	0.5× under
84	Mercier	106.3 Bq/m³	0.5× under
85	Saint-Lambert-de-Lauzon	104.3 Bq/m³	0.5× under
86	L'Ancienne-Lorette	103.7 Bq/m³	0.5× under
87	Laval	103.6 Bq/m³	0.5× under
88	Princeville	103.6 Bq/m³	0.5× under
89	Lachute	103.5 Bq/m³	0.5× under
90	Temiscaming	103.1 Bq/m³	0.5× under
91	Kirkland	102.9 Bq/m³	0.5× under
92	Cookshire-Eaton	102.6 Bq/m³	0.5× under
93	Gatineau	100.9 Bq/m³	0.5× under
94	Saint-Jacques	100.4 Bq/m³	0.5× under
95	Victoriaville	100.4 Bq/m³	0.5× under
96	Huntingdon	100.3 Bq/m³	0.5× under
97	Quebec	99.7 Bq/m³	0.5× under
98	Saint-Antonin	98.8 Bq/m³	0.5× under
99	Valcourt	98.0 Bq/m³	0.5× under
100	Sainte-Anne-de-Bellevue	97.3 Bq/m³	0.5× under
101	Repentigny	96.8 Bq/m³	0.5× under
102	Sainte-Marie	96.8 Bq/m³	0.5× under
103	Saint-Pie	95.3 Bq/m³	0.5× under
104	Candiac	94.8 Bq/m³	0.5× under
105	Saint-Joseph-de-Coleraine	94.6 Bq/m³	0.5× under
106	Sainte Catherine de la Jacques Cartier	93.7 Bq/m³	0.5× under
107	Carignan	93.5 Bq/m³	0.5× under
108	Saint-Jerome	93.1 Bq/m³	0.5× under
109	Marieville	90.5 Bq/m³	0.5× under
110	Salaberry-de-Valleyfield	90.1 Bq/m³	0.5× under
111	Boucherville	89.5 Bq/m³	0.4× under
112	Rigaud	89.4 Bq/m³	0.4× under
113	Beaupre	89.1 Bq/m³	0.4× under
114	Berthierville	88.7 Bq/m³	0.4× under
115	La Tuque	88.6 Bq/m³	0.4× under
116	Saint-Colomban	88.4 Bq/m³	0.4× under
117	Fort-Coulonge	87.9 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	Cote-Saint-Luc	86.7 Bq/m³	0.4× under
121	Bedford	86.5 Bq/m³	0.4× under
122	Saint-Damase	85.5 Bq/m³	0.4× under
123	Charlemagne	85.4 Bq/m³	0.4× under
124	Dollard-Des Ormeaux	85.0 Bq/m³	0.4× under
125	Mascouche	83.0 Bq/m³	0.4× under
126	Sainte-Therese	82.4 Bq/m³	0.4× under
127	Bois-des-Filion	79.9 Bq/m³	0.4× under
128	Windsor	79.3 Bq/m³	0.4× under
129	Richmond	78.1 Bq/m³	0.4× under
130	L'Epiphanie	76.8 Bq/m³	0.4× under
131	Saint-Bruno-de-Montarville	76.6 Bq/m³	0.4× under
132	La Prairie	75.6 Bq/m³	0.4× under
133	Les Coteaux	74.2 Bq/m³	0.4× under
134	Sept-Iles	74.1 Bq/m³	0.4× under
135	Saint-Lazare	73.8 Bq/m³	0.4× under
136	Baie-Saint-Paul	72.6 Bq/m³	0.4× under
137	Sainte-Thecle	72.6 Bq/m³	0.4× under
138	Papineauville	72.2 Bq/m³	0.4× under
139	Saint-Remi	71.8 Bq/m³	0.4× under
140	Pointe-Claire	71.4 Bq/m³	0.4× under
141	Dorval	71.3 Bq/m³	0.4× under
142	Asbestos	71.2 Bq/m³	0.4× under
143	Louiseville	70.6 Bq/m³	0.4× under
144	Saint-Leonard	70.4 Bq/m³	0.4× under
145	Rougemont	68.7 Bq/m³	0.3× under
146	Longueuil	68.5 Bq/m³	0.3× under
147	Ferme-Neuve	67.8 Bq/m³	0.3× under
148	Terrebonne	67.2 Bq/m³	0.3× under
149	Lorraine	65.8 Bq/m³	0.3× under
150	Saint-Augustin-de-Desmaures	65.6 Bq/m³	0.3× under
151	Acton Vale	64.8 Bq/m³	0.3× under
152	Prevost	64.8 Bq/m³	0.3× under
153	La Malbaie	64.4 Bq/m³	0.3× under
154	Beauharnois	63.8 Bq/m³	0.3× under
155	Saint-Antoine-de-Tilly	62.4 Bq/m³	0.3× under
156	Brossard	60.3 Bq/m³	0.3× under
157	Lavaltrie	59.9 Bq/m³	0.3× under
158	Sainte-Anne-des-Plaines	59.7 Bq/m³	0.3× under
159	Lacolle	59.2 Bq/m³	0.3× under
160	Sorel-Tracy	58.0 Bq/m³	0.3× under
161	Contrecoeur	57.6 Bq/m³	0.3× under
162	Blainville	55.6 Bq/m³	0.3× under
163	Montreal	55.5 Bq/m³	0.3× under
164	Saint-Laurent	55.3 Bq/m³	0.3× under
165	Saint-Lin-Laurentides	55.0 Bq/m³	0.3× under
166	Mont-Tremblant	54.6 Bq/m³	0.3× under
167	La Sarre	53.2 Bq/m³	0.3× under
168	Saint-Felix-de-Valois	52.0 Bq/m³	0.3× under
169	Val-d'Or	51.5 Bq/m³	0.3× under
170	Westmount	50.8 Bq/m³	0.3× under
171	Saguenay	50.6 Bq/m³	0.3× under
172	Warwick	49.9 Bq/m³	0.2× under
173	Saint-Marc-des-Carrieres	49.6 Bq/m³	0.2× under
174	Saint-Raymond	49.4 Bq/m³	0.2× under
175	Crabtree	49.0 Bq/m³	0.2× under
176	Shawinigan	48.8 Bq/m³	0.2× under
177	Mont-Royal	48.7 Bq/m³	0.2× under
178	Maskinonge	47.6 Bq/m³	0.2× under
179	Hampstead	46.4 Bq/m³	0.2× under
180	Kingsey Falls	46.3 Bq/m³	0.2× under
181	Jonquiere	46.0 Bq/m³	0.2× under
182	Saint-Tite	46.0 Bq/m³	0.2× under
183	Nicolet	45.9 Bq/m³	0.2× under
184	Brownsburg-Chatham	45.0 Bq/m³	0.2× under
185	Becancour	44.9 Bq/m³	0.2× under
186	Breakeyville	44.3 Bq/m³	0.2× under
187	Montreal-Ouest	44.1 Bq/m³	0.2× under
188	Rouyn-Noranda	43.5 Bq/m³	0.2× under
189	Thetford-Mines	42.2 Bq/m³	0.2× under
190	Drummondville	42.0 Bq/m³	0.2× under
191	Rawdon	41.8 Bq/m³	0.2× under
192	Napierville	41.0 Bq/m³	0.2× under
193	Sainte-Agathe-des-Monts	40.7 Bq/m³	0.2× under
194	Sainte-Sophie	40.6 Bq/m³	0.2× under
195	Val-David	40.6 Bq/m³	0.2× under
196	Alma	40.5 Bq/m³	0.2× under
197	Farnham	40.4 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	35.7 Bq/m³	0.2× under
201	Saint-Sauveur	35.2 Bq/m³	0.2× under
202	Notre-Dame-des-Prairies	32.6 Bq/m³	0.2× under
203	Ville-Marie	31.7 Bq/m³	0.2× under
204	Joliette	30.9 Bq/m³	0.2× under
205	Trois-Rivieres	29.1 Bq/m³	0.1× under
206	Sainte-Catherine	28.5 Bq/m³	0.1× under
207	Sainte-Julienne	27.7 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