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 October 19, 2026

Highest city

289.6Bq/m³

Chandler

Quebec city average

102.9Bq/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	287.5 Bq/m³	1.4× over
3	Shawville	285.4 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	Deux-Montagnes	222.6 Bq/m³	1.1× over
8	Beauceville	221.1 Bq/m³	1.1× over
9	Mont-Laurier	216.8 Bq/m³	1.1× over
10	Riviere-Rouge	216.6 Bq/m³	1.1× over
11	Carleton-sur-Mer	209.5 Bq/m³	1.0× over
12	Fossambault-sur-lac	208.0 Bq/m³	1.0× over
13	Maniwaki	203.3 Bq/m³	1.0× over
14	Bellechasse Regional County Municipality	202.3 Bq/m³	1.0× over
✓ Below EPA action level (200 Bq/m³)
15	New-Richmond	198.5 Bq/m³	1.0× under
16	Mont-Joli	194.3 Bq/m³	1.0× under
17	Beaconsfield	190.9 Bq/m³	1.0× under
18	Oka	182.6 Bq/m³	0.9× under
19	Coaticook	180.5 Bq/m³	0.9× under
20	Labelle	180.1 Bq/m³	0.9× under
21	Baie-D'Urfe	178.8 Bq/m³	0.9× under
22	Matane	178.6 Bq/m³	0.9× under
23	Rimouski	178.6 Bq/m³	0.9× under
24	Saint-Eustache	177.9 Bq/m³	0.9× under
25	Cap-Sante	169.7 Bq/m³	0.8× under
26	Montmagny	167.6 Bq/m³	0.8× under
27	Saint-Andre-Avellin	164.0 Bq/m³	0.8× under
28	Lac-Megantic	161.5 Bq/m³	0.8× under
29	Sutton	161.5 Bq/m³	0.8× under
30	Sherbrooke	161.3 Bq/m³	0.8× under
31	Mirabel	160.2 Bq/m³	0.8× under
32	Baie-Comeau	159.8 Bq/m³	0.8× under
33	Wakefield	156.8 Bq/m³	0.8× under
34	Shannon	155.8 Bq/m³	0.8× under
35	Bromont	154.9 Bq/m³	0.8× under
36	Saint-Come--Liniere	154.2 Bq/m³	0.8× under
37	Chambly	153.0 Bq/m³	0.8× under
38	Donnacona	152.8 Bq/m³	0.8× under
39	Chateau-Richer	150.6 Bq/m³	0.8× under
40	Adstock	147.9 Bq/m³	0.7× under
41	Amqui	141.8 Bq/m³	0.7× under
42	East Angus	140.7 Bq/m³	0.7× under
43	Varennes	140.3 Bq/m³	0.7× under
44	Otterburn Park	138.2 Bq/m³	0.7× under
45	Waterloo	138.0 Bq/m³	0.7× under
46	Boisbriand	137.6 Bq/m³	0.7× under
47	L'Ile-Perrot	137.6 Bq/m³	0.7× under
48	Montreal-Est	137.6 Bq/m³	0.7× under
49	Cowansville	136.8 Bq/m³	0.7× under
50	Les Cedres	136.4 Bq/m³	0.7× under
51	Sainte-Marthe-sur-le-Lac	135.5 Bq/m³	0.7× under
52	Granby	133.5 Bq/m³	0.7× under
53	Vercheres	132.3 Bq/m³	0.7× under
54	Roberval	131.1 Bq/m³	0.7× under
55	Neuville	130.4 Bq/m³	0.7× under
56	Saint-Basile-le-Grand	130.0 Bq/m³	0.7× under
57	Saint-Jean-sur-Richelieu	126.9 Bq/m³	0.6× under
58	Chateauguay	125.8 Bq/m³	0.6× under
59	Magog	125.0 Bq/m³	0.6× under
60	Ormstown	125.0 Bq/m³	0.6× under
61	Vaudreuil-Dorion	123.0 Bq/m³	0.6× under
62	Pincourt	121.6 Bq/m³	0.6× under
63	Cabano	121.4 Bq/m³	0.6× under
64	Saint-Constant	120.9 Bq/m³	0.6× under
65	Saint-Cesaire	120.2 Bq/m³	0.6× under
66	Val-des-Monts	119.5 Bq/m³	0.6× under
67	Notre-Dame-de-l'Ile-Perrot	119.3 Bq/m³	0.6× under
68	Pont-Rouge	118.7 Bq/m³	0.6× under
69	La Pocatiere	118.6 Bq/m³	0.6× under
70	Sainte-Julie	117.3 Bq/m³	0.6× under
71	Saint-Denis-sur-Richelieu	117.0 Bq/m³	0.6× under
72	Levis	116.8 Bq/m³	0.6× under
73	Ferme-Neuve	114.0 Bq/m³	0.6× under
74	Hudson	113.9 Bq/m³	0.6× under
75	Richelieu	111.6 Bq/m³	0.6× under
76	Berthierville	111.4 Bq/m³	0.6× under
77	Saint-Hyacinthe	110.8 Bq/m³	0.6× under
78	Mont-Saint-Hilaire	110.7 Bq/m³	0.6× under
79	Delson	110.5 Bq/m³	0.6× under
80	Lac-Brome	109.9 Bq/m³	0.5× under
81	Rosemere	109.7 Bq/m³	0.5× under
82	Saint-Henri	108.8 Bq/m³	0.5× under
83	Riviere-du-Loup	108.4 Bq/m³	0.5× under
84	Mercier	108.2 Bq/m³	0.5× under
85	Sainte-Martine	108.1 Bq/m³	0.5× under
86	Saint-Joseph-de-Beauce	107.7 Bq/m³	0.5× under
87	L'Ancienne-Lorette	103.8 Bq/m³	0.5× under
88	Princeville	103.6 Bq/m³	0.5× under
89	Lachute	103.5 Bq/m³	0.5× under
90	Laval	103.2 Bq/m³	0.5× under
91	Temiscaming	103.1 Bq/m³	0.5× under
92	Kirkland	103.0 Bq/m³	0.5× under
93	Cookshire-Eaton	102.6 Bq/m³	0.5× under
94	Saint-Lambert-de-Lauzon	102.3 Bq/m³	0.5× under
95	Gatineau	101.1 Bq/m³	0.5× under
96	Huntingdon	100.3 Bq/m³	0.5× under
97	Victoriaville	99.7 Bq/m³	0.5× under
98	Asbestos	99.1 Bq/m³	0.5× under
99	Quebec	99.1 Bq/m³	0.5× under
100	Saint-Antonin	98.8 Bq/m³	0.5× under
101	Valcourt	98.0 Bq/m³	0.5× under
102	Sainte-Anne-de-Bellevue	97.3 Bq/m³	0.5× under
103	Saint-Jacques	97.2 Bq/m³	0.5× under
104	Bonaventure	96.9 Bq/m³	0.5× under
105	Sainte-Marie	96.8 Bq/m³	0.5× under
106	Repentigny	96.5 Bq/m³	0.5× under
107	Saint-Pie	95.3 Bq/m³	0.5× under
108	Candiac	95.0 Bq/m³	0.5× under
109	Carignan	94.6 Bq/m³	0.5× under
110	Saint-Joseph-de-Coleraine	94.6 Bq/m³	0.5× under
111	Sainte Catherine de la Jacques Cartier	93.7 Bq/m³	0.5× under
112	Marieville	92.5 Bq/m³	0.5× under
113	Saint-Jerome	92.2 Bq/m³	0.5× under
114	Salaberry-de-Valleyfield	90.5 Bq/m³	0.5× under
115	Boucherville	90.2 Bq/m³	0.5× under
116	Beaupre	89.1 Bq/m³	0.4× under
117	Bedford	89.0 Bq/m³	0.4× under
118	La Tuque	88.6 Bq/m³	0.4× under
119	Fort-Coulonge	87.9 Bq/m³	0.4× under
120	Saint-Colomban	87.4 Bq/m³	0.4× under
121	Rigaud	87.3 Bq/m³	0.4× under
122	L'Assomption	86.8 Bq/m³	0.4× under
123	Cote-Saint-Luc	86.7 Bq/m³	0.4× under
124	Saint-Damase	85.5 Bq/m³	0.4× under
125	Mascouche	85.4 Bq/m³	0.4× under
126	Sainte-Therese	84.8 Bq/m³	0.4× under
127	Papineauville	84.7 Bq/m³	0.4× under
128	Bois-des-Filion	84.3 Bq/m³	0.4× under
129	Dollard-Des Ormeaux	84.3 Bq/m³	0.4× under
130	Charlemagne	84.2 Bq/m³	0.4× under
131	Windsor	80.2 Bq/m³	0.4× under
132	Richmond	78.1 Bq/m³	0.4× under
133	L'Epiphanie	76.8 Bq/m³	0.4× under
134	Saint-Bruno-de-Montarville	76.5 Bq/m³	0.4× under
135	La Prairie	76.2 Bq/m³	0.4× under
136	Sept-Iles	74.4 Bq/m³	0.4× under
137	Saint-Lazare	73.4 Bq/m³	0.4× under
138	Les Coteaux	73.3 Bq/m³	0.4× under
139	Baie-Saint-Paul	72.6 Bq/m³	0.4× under
140	Pointe-Claire	71.9 Bq/m³	0.4× under
141	Saint-Remi	71.6 Bq/m³	0.4× under
142	Dorval	71.3 Bq/m³	0.4× under
143	Louiseville	70.6 Bq/m³	0.4× under
144	Saint-Leonard	70.2 Bq/m³	0.4× under
145	Longueuil	69.7 Bq/m³	0.3× under
146	Sainte-Thecle	69.7 Bq/m³	0.3× under
147	Saint-Augustin-de-Desmaures	69.4 Bq/m³	0.3× under
148	Rougemont	68.7 Bq/m³	0.3× under
149	Beauharnois	67.8 Bq/m³	0.3× under
150	Terrebonne	67.1 Bq/m³	0.3× under
151	Lorraine	65.1 Bq/m³	0.3× under
152	Acton Vale	64.8 Bq/m³	0.3× under
153	La Malbaie	64.4 Bq/m³	0.3× under
154	Prevost	64.2 Bq/m³	0.3× under
155	Saint-Antoine-de-Tilly	62.4 Bq/m³	0.3× under
156	Sorel-Tracy	60.5 Bq/m³	0.3× under
157	Brossard	60.2 Bq/m³	0.3× under
158	Lavaltrie	59.9 Bq/m³	0.3× under
159	Lacolle	59.2 Bq/m³	0.3× under
160	Sainte-Anne-des-Plaines	59.2 Bq/m³	0.3× under
161	Contrecoeur	57.5 Bq/m³	0.3× under
162	Saint-Lin-Laurentides	56.7 Bq/m³	0.3× under
163	Blainville	56.1 Bq/m³	0.3× under
164	Montreal	55.5 Bq/m³	0.3× under
165	Saint-Laurent	55.2 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	Westmount	51.8 Bq/m³	0.3× under
169	Warwick	51.4 Bq/m³	0.3× under
170	Val-d'Or	50.8 Bq/m³	0.3× under
171	Saint-Felix-de-Valois	50.7 Bq/m³	0.3× under
172	Saguenay	50.1 Bq/m³	0.3× under
173	Saint-Raymond	49.2 Bq/m³	0.2× under
174	Crabtree	49.0 Bq/m³	0.2× under
175	Mont-Royal	48.2 Bq/m³	0.2× under
176	Shawinigan	48.1 Bq/m³	0.2× under
177	Saint-Marc-des-Carrieres	47.9 Bq/m³	0.2× under
178	Jonquiere	47.7 Bq/m³	0.2× under
179	Maskinonge	47.6 Bq/m³	0.2× under
180	Napierville	47.2 Bq/m³	0.2× under
181	Hampstead	46.4 Bq/m³	0.2× under
182	Kingsey Falls	46.3 Bq/m³	0.2× under
183	Saint-Tite	46.0 Bq/m³	0.2× under
184	Nicolet	44.8 Bq/m³	0.2× under
185	Becancour	44.5 Bq/m³	0.2× under
186	Montreal-Ouest	44.1 Bq/m³	0.2× under
187	Breakeyville	43.7 Bq/m³	0.2× under
188	Rouyn-Noranda	43.5 Bq/m³	0.2× under
189	Rawdon	43.4 Bq/m³	0.2× under
190	Notre-Dame-des-Prairies	42.7 Bq/m³	0.2× under
191	Brownsburg-Chatham	42.4 Bq/m³	0.2× under
192	Thetford-Mines	42.2 Bq/m³	0.2× under
193	Drummondville	42.1 Bq/m³	0.2× under
194	Sainte-Agathe-des-Monts	40.8 Bq/m³	0.2× under
195	Sainte-Sophie	40.6 Bq/m³	0.2× under
196	Farnham	40.4 Bq/m³	0.2× under
197	Alma	40.1 Bq/m³	0.2× under
198	Val-David	40.0 Bq/m³	0.2× under
199	Saint-Sauveur	39.9 Bq/m³	0.2× under
200	Pierreville	37.8 Bq/m³	0.2× under
201	Saint-Germain-de-Grantham	37.5 Bq/m³	0.2× under
202	Amos	36.8 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	Trois-Rivieres	29.1 Bq/m³	0.1× under
206	Sainte-Catherine	28.6 Bq/m³	0.1× under
207	Sainte-Julienne	28.5 Bq/m³	0.1× under
208	Saint-Gabriel	25.6 Bq/m³	0.1× under
209	Saint-Cyrille-de-Wendover	23.7 Bq/m³	0.1× under
210	Sainte-Adele	23.2 Bq/m³	0.1× under
211	Daveluyville	21.2 Bq/m³	0.1× under

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