Massachusetts Cities Ranked by Indoor Radon Levels

Measured averages from Airthings devices across Massachusetts, USA. Action level: 4 pCi/L — the threshold at which remediation is recommended.

East Douglas has the highest measured indoor radon in Massachusetts at 19.1 pCi/L, based on Airthings measurements across 254 cities.

Updated August 16, 2026

Highest city

19.1pCi/L

East Douglas

Massachusetts city average

2.4pCi/L

across 254 cities

Above action level

20/ 254

cities

Massachusetts Cities Ranked by Indoor Radon Levels
#	Location	Avg level	Monitors	vs action level
1	East Douglas	19.1 pCi/L	10	4.8× over
2	Oxford	7.3 pCi/L	13	1.8× over
3	Leicester	6.3 pCi/L	11	1.6× over
4	Lanesborough	5.5 pCi/L	8	1.4× over
5	Upton	5.5 pCi/L	14	1.4× over
6	Ashburnham	5.4 pCi/L	6	1.4× over
7	Northbridge	5.3 pCi/L	22	1.3× over
8	Beverly Cove	5.1 pCi/L	17	1.3× over
9	Dudley	5.0 pCi/L	7	1.3× over
10	Fall River	4.6 pCi/L	17	1.2× over
11	Boylston	4.2 pCi/L	9	1.1× over
12	Auburn	4.2 pCi/L	17	1.1× over
13	North Westport	4.2 pCi/L	10	1.0× over
14	Beverly	4.1 pCi/L	25	1.0× over
15	Amesbury	4.1 pCi/L	18	1.0× over
16	Ipswich	4.1 pCi/L	18	1.0× over
17	Mansfield	4.1 pCi/L	15	1.0× over
18	Seekonk	4.0 pCi/L	9	1.0× over
19	Hamilton	4.0 pCi/L	17	1.0× over
20	Boxford	4.0 pCi/L	26	1.0× over
✓ Below EPA action level (4 pCi/L)
21	Chelmsford	4.0 pCi/L	46	1.0× under
22	Lunenburg	3.9 pCi/L	15	1.0× under
23	Head of Westport	3.9 pCi/L	20	1.0× under
24	Millville	3.9 pCi/L	7	1.0× under
25	Duxbury	3.8 pCi/L	7	1.0× under
26	Carver	3.8 pCi/L	10	0.9× under
27	West Boylston	3.8 pCi/L	17	0.9× under
28	Topsfield	3.7 pCi/L	10	0.9× under
29	Webster	3.7 pCi/L	17	0.9× under
30	Housatonic	3.7 pCi/L	7	0.9× under
31	Smith Mills	3.7 pCi/L	19	0.9× under
32	Wilbraham	3.6 pCi/L	19	0.9× under
33	Braintree	3.6 pCi/L	45	0.9× under
34	Falmouth	3.6 pCi/L	16	0.9× under
35	Harvard	3.6 pCi/L	29	0.9× under
36	Shrewsbury	3.5 pCi/L	65	0.9× under
37	Dunstable	3.4 pCi/L	28	0.9× under
38	West Newbury	3.4 pCi/L	23	0.9× under
39	South Peabody	3.4 pCi/L	23	0.9× under
40	Lynnfield	3.4 pCi/L	28	0.8× under
41	Freetown	3.4 pCi/L	10	0.8× under
42	Grafton	3.3 pCi/L	32	0.8× under
43	Gloucester	3.2 pCi/L	30	0.8× under
44	Bolton	3.2 pCi/L	33	0.8× under
45	Dighton	3.2 pCi/L	7	0.8× under
46	Billerica	3.2 pCi/L	32	0.8× under
47	Charlton	3.1 pCi/L	10	0.8× under
48	Ashfield	3.1 pCi/L	7	0.8× under
49	Westminster	3.1 pCi/L	9	0.8× under
50	Littleton Common	3.1 pCi/L	27	0.8× under
51	Whitinsville	3.1 pCi/L	10	0.8× under
52	Norwood	3.0 pCi/L	32	0.8× under
53	Leverett	3.0 pCi/L	12	0.7× under
54	Greenfield	3.0 pCi/L	11	0.7× under
55	Newburyport	3.0 pCi/L	46	0.7× under
56	Dracut	2.9 pCi/L	15	0.7× under
57	Andover	2.9 pCi/L	102	0.7× under
58	Westford	2.8 pCi/L	84	0.7× under
59	Fitchburg	2.8 pCi/L	8	0.7× under
60	West Concord	2.8 pCi/L	20	0.7× under
61	South Hadley	2.8 pCi/L	9	0.7× under
62	Millbury	2.8 pCi/L	16	0.7× under
63	Lawrence	2.8 pCi/L	13	0.7× under
64	Lincoln	2.8 pCi/L	39	0.7× under
65	Brockton	2.8 pCi/L	10	0.7× under
66	Sudbury	2.7 pCi/L	58	0.7× under
67	Westwood	2.7 pCi/L	35	0.7× under
68	Easton	2.7 pCi/L	24	0.7× under
69	Groveland	2.7 pCi/L	15	0.7× under
70	Berkley	2.7 pCi/L	7	0.7× under
71	Saugus	2.7 pCi/L	22	0.7× under
72	Pepperell	2.7 pCi/L	12	0.7× under
73	Hubbardston	2.7 pCi/L	11	0.7× under
74	North Reading	2.6 pCi/L	42	0.7× under
75	Attleboro	2.6 pCi/L	36	0.7× under
76	Milton	2.6 pCi/L	74	0.7× under
77	Sunderland	2.6 pCi/L	8	0.7× under
78	Leominster	2.6 pCi/L	26	0.6× under
79	Natick	2.6 pCi/L	60	0.6× under
80	Williamsburg	2.6 pCi/L	12	0.6× under
81	Stoneham	2.6 pCi/L	35	0.6× under
82	Westborough	2.6 pCi/L	36	0.6× under
83	Richmond	2.5 pCi/L	17	0.6× under
84	Woburn	2.5 pCi/L	44	0.6× under
85	Wenham	2.5 pCi/L	18	0.6× under
86	Cochituate	2.5 pCi/L	28	0.6× under
87	Worcester	2.5 pCi/L	39	0.6× under
88	Mansfield Center	2.5 pCi/L	11	0.6× under
89	Southborough	2.5 pCi/L	40	0.6× under
90	Stow	2.5 pCi/L	43	0.6× under
91	Hampden	2.5 pCi/L	6	0.6× under
92	Holden	2.5 pCi/L	21	0.6× under
93	Marlborough	2.5 pCi/L	48	0.6× under
94	Reading	2.5 pCi/L	69	0.6× under
95	Abington	2.4 pCi/L	10	0.6× under
96	Hingham	2.4 pCi/L	46	0.6× under
97	Holbrook	2.4 pCi/L	9	0.6× under
98	Southampton	2.4 pCi/L	9	0.6× under
99	Wakefield	2.4 pCi/L	43	0.6× under
100	Uxbridge	2.4 pCi/L	21	0.6× under
101	Ayer	2.4 pCi/L	13	0.6× under
102	White Island Shores	2.4 pCi/L	14	0.6× under
103	South Duxbury	2.4 pCi/L	7	0.6× under
104	Sterling	2.3 pCi/L	12	0.6× under
105	Norwell	2.3 pCi/L	17	0.6× under
106	Rowley	2.3 pCi/L	20	0.6× under
107	Rutland	2.3 pCi/L	16	0.6× under
108	Sturbridge	2.3 pCi/L	9	0.6× under
109	Winchendon	2.3 pCi/L	6	0.6× under
110	Melrose	2.3 pCi/L	66	0.6× under
111	Townsend	2.3 pCi/L	6	0.6× under
112	Great Barrington	2.3 pCi/L	19	0.6× under
113	Hudson	2.3 pCi/L	29	0.6× under
114	Plymouth	2.3 pCi/L	41	0.6× under
115	Dalton	2.3 pCi/L	8	0.6× under
116	Dedham	2.3 pCi/L	67	0.6× under
117	Stoughton	2.3 pCi/L	22	0.6× under
118	Wilmington	2.3 pCi/L	39	0.6× under
119	Haverhill	2.3 pCi/L	18	0.6× under
120	Medfield	2.3 pCi/L	45	0.6× under
121	West Tisbury	2.3 pCi/L	9	0.6× under
122	Williamstown	2.3 pCi/L	13	0.6× under
123	Framingham	2.2 pCi/L	34	0.6× under
124	Peabody	2.2 pCi/L	14	0.6× under
125	South Amherst	2.2 pCi/L	9	0.6× under
126	Tyngsboro	2.2 pCi/L	27	0.6× under
127	Wayland	2.2 pCi/L	54	0.6× under
128	Framingham Center	2.2 pCi/L	49	0.5× under
129	Westfield	2.2 pCi/L	15	0.5× under
130	Lexington	2.1 pCi/L	152	0.5× under
131	Salem	2.1 pCi/L	33	0.5× under
132	Maynard	2.1 pCi/L	38	0.5× under
133	Northborough	2.1 pCi/L	31	0.5× under
134	North Falmouth	2.1 pCi/L	10	0.5× under
135	Acton	2.1 pCi/L	65	0.5× under
136	Danvers	2.1 pCi/L	30	0.5× under
137	Carlisle	2.1 pCi/L	66	0.5× under
138	Rockland	2.1 pCi/L	36	0.5× under
139	Bellingham	2.0 pCi/L	15	0.5× under
140	Methuen	2.0 pCi/L	60	0.5× under
141	Winchester	2.0 pCi/L	87	0.5× under
142	Franklin	2.0 pCi/L	40	0.5× under
143	Hopkinton	2.0 pCi/L	34	0.5× under
144	Paxton	2.0 pCi/L	9	0.5× under
145	Lenox	2.0 pCi/L	6	0.5× under
146	Clinton	2.0 pCi/L	9	0.5× under
147	Ashland	2.0 pCi/L	35	0.5× under
148	Foxborough	2.0 pCi/L	21	0.5× under
149	Pinehurst	1.9 pCi/L	18	0.5× under
150	Tewksbury	1.9 pCi/L	21	0.5× under
151	Norton	1.9 pCi/L	11	0.5× under
152	Hanson	1.9 pCi/L	6	0.5× under
153	Holyoke	1.9 pCi/L	11	0.5× under
154	Sagamore	1.9 pCi/L	10	0.5× under
155	Kingston	1.9 pCi/L	18	0.5× under
156	Mashpee	1.9 pCi/L	8	0.5× under
157	Raynham	1.9 pCi/L	6	0.5× under
158	Sherborn	1.9 pCi/L	22	0.5× under
159	Groton	1.9 pCi/L	37	0.5× under
160	Medway	1.9 pCi/L	31	0.5× under
161	Needham	1.9 pCi/L	82	0.5× under
162	Rockport	1.9 pCi/L	9	0.5× under
163	Weston	1.9 pCi/L	71	0.5× under
164	Amherst Center	1.8 pCi/L	12	0.5× under
165	Brewster	1.8 pCi/L	7	0.5× under
166	Sharon	1.8 pCi/L	55	0.5× under
167	Princeton	1.8 pCi/L	14	0.5× under
168	Centerville	1.8 pCi/L	15	0.5× under
169	North Andover	1.8 pCi/L	42	0.5× under
170	Belmont	1.8 pCi/L	95	0.4× under
171	Weymouth	1.8 pCi/L	47	0.4× under
172	East Falmouth	1.8 pCi/L	18	0.4× under
173	Ludlow	1.8 pCi/L	9	0.4× under
174	Wellesley	1.8 pCi/L	103	0.4× under
175	Newton	1.8 pCi/L	196	0.4× under
176	Pittsfield	1.8 pCi/L	20	0.4× under
177	Chicopee	1.7 pCi/L	10	0.4× under
178	Concord	1.7 pCi/L	31	0.4× under
179	Norfolk	1.7 pCi/L	19	0.4× under
180	Millis-Clicquot	1.7 pCi/L	9	0.4× under
181	Waltham	1.7 pCi/L	88	0.4× under
182	Granby	1.7 pCi/L	6	0.4× under
183	Jamaica Plain	1.7 pCi/L	71	0.4× under
184	Dover	1.7 pCi/L	16	0.4× under
185	Hanover	1.7 pCi/L	10	0.4× under
186	Plainville	1.7 pCi/L	38	0.4× under
187	Medford	1.6 pCi/L	126	0.4× under
188	Swampscott	1.6 pCi/L	28	0.4× under
189	Rehoboth	1.6 pCi/L	25	0.4× under
190	Lowell	1.6 pCi/L	30	0.4× under
191	West Barnstable	1.6 pCi/L	7	0.4× under
192	Wrentham	1.6 pCi/L	14	0.4× under
193	Burlington	1.6 pCi/L	36	0.4× under
194	North Amherst	1.6 pCi/L	6	0.4× under
195	Easthampton	1.6 pCi/L	18	0.4× under
196	Holliston	1.6 pCi/L	34	0.4× under
197	Scituate	1.6 pCi/L	6	0.4× under
198	Middleton	1.6 pCi/L	19	0.4× under
199	Cordaville	1.6 pCi/L	16	0.4× under
200	Marstons Mills	1.6 pCi/L	7	0.4× under
201	North Adams	1.6 pCi/L	11	0.4× under
202	Millis	1.6 pCi/L	7	0.4× under
203	Sutton	1.5 pCi/L	9	0.4× under
204	North Lakeville	1.5 pCi/L	11	0.4× under
205	Canton	1.5 pCi/L	27	0.4× under
206	Northampton	1.5 pCi/L	47	0.4× under
207	South Boston	1.5 pCi/L	44	0.4× under
208	Chelsea	1.5 pCi/L	9	0.4× under
209	Marblehead	1.5 pCi/L	56	0.4× under
210	Bliss Corner	1.5 pCi/L	14	0.4× under
211	Brookline	1.5 pCi/L	114	0.4× under
212	Norton Center	1.5 pCi/L	8	0.4× under
213	Essex	1.5 pCi/L	17	0.4× under
214	Arlington	1.4 pCi/L	172	0.4× under
215	Marshfield Hills	1.4 pCi/L	7	0.4× under
216	Somerville	1.4 pCi/L	100	0.4× under
217	Cohasset	1.4 pCi/L	10	0.4× under
218	Malden	1.4 pCi/L	38	0.4× under
219	North Seekonk	1.4 pCi/L	14	0.3× under
220	Walpole	1.4 pCi/L	32	0.3× under
221	Hopedale	1.4 pCi/L	9	0.3× under
222	Marshfield	1.3 pCi/L	16	0.3× under
223	Watertown	1.3 pCi/L	127	0.3× under
224	East Longmeadow	1.3 pCi/L	6	0.3× under
225	Randolph	1.2 pCi/L	10	0.3× under
226	Swansea	1.2 pCi/L	13	0.3× under
227	North Scituate	1.2 pCi/L	6	0.3× under
228	Agawam	1.2 pCi/L	10	0.3× under
229	Belchertown	1.2 pCi/L	24	0.3× under
230	Cambridge	1.2 pCi/L	130	0.3× under
231	Yarmouth	1.2 pCi/L	7	0.3× under
232	Bedford	1.1 pCi/L	52	0.3× under
233	Edgartown	1.1 pCi/L	8	0.3× under
234	Marion	1.1 pCi/L	6	0.3× under
235	Quincy	1.1 pCi/L	44	0.3× under
236	Shirley	1.1 pCi/L	6	0.3× under
237	North Pembroke	1.1 pCi/L	8	0.3× under
238	Middleborough Center	1.1 pCi/L	7	0.3× under
239	Milford	1.1 pCi/L	15	0.3× under
240	Revere	1.1 pCi/L	11	0.3× under
241	Fairhaven	1.1 pCi/L	6	0.3× under
242	Winthrop	1.1 pCi/L	12	0.3× under
243	Longmeadow	1.1 pCi/L	17	0.3× under
244	Everett	1.0 pCi/L	6	0.3× under
245	Somerset	1.0 pCi/L	8	0.3× under
246	New Bedford	1.0 pCi/L	7	0.2× under
247	West Springfield	1.0 pCi/L	11	0.2× under
248	Mendon	0.9 pCi/L	14	0.2× under
249	Taunton	0.9 pCi/L	8	0.2× under
250	South Yarmouth	0.9 pCi/L	6	0.2× under
251	South Deerfield	0.8 pCi/L	9	0.2× under
252	Gardner	0.8 pCi/L	6	0.2× under
253	Whitman	0.8 pCi/L	10	0.2× under
254	Boston	0.7 pCi/L	161	0.2× under

See USA cities ranked by radon level See all States ranked by radon level