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 272 cities.

Updated October 19, 2026

Highest city

19.1pCi/L

East Douglas

Massachusetts city average

2.4pCi/L

across 272 cities

Above action level

22/ 272

cities

Massachusetts Cities Ranked by Indoor Radon Levels
#	Location	Avg level	vs action level
1	East Douglas	19.1 pCi/L	4.8× over
2	Oxford	7.4 pCi/L	1.8× over
3	Leicester	6.3 pCi/L	1.6× over
4	Ashburnham	5.8 pCi/L	1.5× over
5	Lanesborough	5.6 pCi/L	1.4× over
6	Dudley	5.4 pCi/L	1.4× over
7	Northbridge	5.3 pCi/L	1.3× over
8	Merrimac	5.2 pCi/L	1.3× over
9	Upton	5.1 pCi/L	1.3× over
10	Beverly Cove	4.6 pCi/L	1.1× over
11	North Westport	4.4 pCi/L	1.1× over
12	Fall River	4.4 pCi/L	1.1× over
13	Ipswich	4.4 pCi/L	1.1× over
14	Assonet	4.2 pCi/L	1.1× over
15	Boylston	4.2 pCi/L	1.1× over
16	Auburn	4.2 pCi/L	1.1× over
17	Dracut	4.2 pCi/L	1.0× over
18	Beverly	4.2 pCi/L	1.0× over
19	Boxford	4.1 pCi/L	1.0× over
20	Mansfield	4.1 pCi/L	1.0× over
21	Seekonk	4.0 pCi/L	1.0× over
22	Harwich Center	4.0 pCi/L	1.0× over
✓ Below EPA action level (4 pCi/L)
23	Amesbury	4.0 pCi/L	1.0× under
24	Hamilton	3.9 pCi/L	1.0× under
25	Head of Westport	3.9 pCi/L	1.0× under
26	Millville	3.9 pCi/L	1.0× under
27	Chelmsford	3.9 pCi/L	1.0× under
28	Lunenburg	3.8 pCi/L	1.0× under
29	Duxbury	3.8 pCi/L	1.0× under
30	Carver	3.8 pCi/L	0.9× under
31	South Peabody	3.8 pCi/L	0.9× under
32	Topsfield	3.7 pCi/L	0.9× under
33	Webster	3.7 pCi/L	0.9× under
34	Gloucester	3.7 pCi/L	0.9× under
35	Housatonic	3.7 pCi/L	0.9× under
36	Bolton	3.7 pCi/L	0.9× under
37	West Boylston	3.7 pCi/L	0.9× under
38	Wilbraham	3.5 pCi/L	0.9× under
39	Braintree	3.5 pCi/L	0.9× under
40	Smith Mills	3.5 pCi/L	0.9× under
41	Lynnfield	3.5 pCi/L	0.9× under
42	Falmouth	3.4 pCi/L	0.9× under
43	Harvard	3.4 pCi/L	0.9× under
44	Grafton	3.4 pCi/L	0.9× under
45	Dunstable	3.4 pCi/L	0.8× under
46	Freetown	3.4 pCi/L	0.8× under
47	Shrewsbury	3.3 pCi/L	0.8× under
48	West Newbury	3.3 pCi/L	0.8× under
49	South Hadley	3.2 pCi/L	0.8× under
50	Billerica	3.2 pCi/L	0.8× under
51	Littleton Common	3.2 pCi/L	0.8× under
52	Dighton	3.2 pCi/L	0.8× under
53	Charlton	3.1 pCi/L	0.8× under
54	Acushnet Center	3.1 pCi/L	0.8× under
55	Ashfield	3.1 pCi/L	0.8× under
56	Westminster	3.1 pCi/L	0.8× under
57	Whitinsville	3.1 pCi/L	0.8× under
58	Leverett	3.0 pCi/L	0.7× under
59	Norwood	3.0 pCi/L	0.7× under
60	Lincoln	2.9 pCi/L	0.7× under
61	Andover	2.9 pCi/L	0.7× under
62	Fitchburg	2.8 pCi/L	0.7× under
63	West Concord	2.8 pCi/L	0.7× under
64	Sudbury	2.8 pCi/L	0.7× under
65	Westford	2.8 pCi/L	0.7× under
66	Attleboro	2.8 pCi/L	0.7× under
67	Lawrence	2.8 pCi/L	0.7× under
68	Millbury	2.8 pCi/L	0.7× under
69	Newburyport	2.8 pCi/L	0.7× under
70	Brockton	2.8 pCi/L	0.7× under
71	Groveland	2.7 pCi/L	0.7× under
72	Berkley	2.7 pCi/L	0.7× under
73	Saugus	2.7 pCi/L	0.7× under
74	Worcester	2.7 pCi/L	0.7× under
75	Framingham	2.7 pCi/L	0.7× under
76	Pepperell	2.7 pCi/L	0.7× under
77	Stow	2.7 pCi/L	0.7× under
78	Hubbardston	2.7 pCi/L	0.7× under
79	North Reading	2.7 pCi/L	0.7× under
80	Easton	2.7 pCi/L	0.7× under
81	Westborough	2.6 pCi/L	0.7× under
82	Stoneham	2.6 pCi/L	0.7× under
83	Westwood	2.6 pCi/L	0.7× under
84	Greenfield	2.6 pCi/L	0.7× under
85	Milton	2.6 pCi/L	0.7× under
86	Sunderland	2.6 pCi/L	0.7× under
87	Leominster	2.6 pCi/L	0.6× under
88	Natick	2.6 pCi/L	0.6× under
89	Woburn	2.6 pCi/L	0.6× under
90	Framingham Center	2.6 pCi/L	0.6× under
91	Richmond	2.5 pCi/L	0.6× under
92	Southwick	2.5 pCi/L	0.6× under
93	Cochituate	2.5 pCi/L	0.6× under
94	Mansfield Center	2.5 pCi/L	0.6× under
95	Hampden	2.5 pCi/L	0.6× under
96	Granville	2.4 pCi/L	0.6× under
97	Southborough	2.4 pCi/L	0.6× under
98	Reading	2.4 pCi/L	0.6× under
99	Holbrook	2.4 pCi/L	0.6× under
100	Holden	2.4 pCi/L	0.6× under
101	Marlborough	2.4 pCi/L	0.6× under
102	West Tisbury	2.4 pCi/L	0.6× under
103	Wenham	2.4 pCi/L	0.6× under
104	Hudson	2.4 pCi/L	0.6× under
105	Wakefield	2.4 pCi/L	0.6× under
106	White Island Shores	2.4 pCi/L	0.6× under
107	Agawam	2.4 pCi/L	0.6× under
108	Hanover	2.4 pCi/L	0.6× under
109	Plymouth	2.4 pCi/L	0.6× under
110	Sterling	2.3 pCi/L	0.6× under
111	Uxbridge	2.3 pCi/L	0.6× under
112	Norwell	2.3 pCi/L	0.6× under
113	Hingham	2.3 pCi/L	0.6× under
114	Rowley	2.3 pCi/L	0.6× under
115	Rutland	2.3 pCi/L	0.6× under
116	Sturbridge	2.3 pCi/L	0.6× under
117	Winchendon	2.3 pCi/L	0.6× under
118	Townsend	2.3 pCi/L	0.6× under
119	Williamsburg	2.3 pCi/L	0.6× under
120	Dalton	2.3 pCi/L	0.6× under
121	Holliston	2.3 pCi/L	0.6× under
122	Dedham	2.3 pCi/L	0.6× under
123	Haverhill	2.3 pCi/L	0.6× under
124	Melrose	2.3 pCi/L	0.6× under
125	Williamstown	2.3 pCi/L	0.6× under
126	Abington	2.2 pCi/L	0.6× under
127	Great Barrington	2.2 pCi/L	0.6× under
128	South Amherst	2.2 pCi/L	0.6× under
129	Southampton	2.2 pCi/L	0.6× under
130	Wilmington	2.2 pCi/L	0.6× under
131	Cotuit	2.2 pCi/L	0.6× under
132	Tyngsboro	2.2 pCi/L	0.6× under
133	Medfield	2.2 pCi/L	0.6× under
134	Foxborough	2.2 pCi/L	0.5× under
135	South Duxbury	2.2 pCi/L	0.5× under
136	Stoughton	2.2 pCi/L	0.5× under
137	Wayland	2.2 pCi/L	0.5× under
138	Westfield	2.2 pCi/L	0.5× under
139	Lexington	2.1 pCi/L	0.5× under
140	North Falmouth	2.1 pCi/L	0.5× under
141	Franklin	2.1 pCi/L	0.5× under
142	Northborough	2.1 pCi/L	0.5× under
143	Maynard	2.1 pCi/L	0.5× under
144	Hopkinton	2.1 pCi/L	0.5× under
145	Carlisle	2.1 pCi/L	0.5× under
146	Danvers	2.1 pCi/L	0.5× under
147	Salem	2.1 pCi/L	0.5× under
148	Rockland	2.1 pCi/L	0.5× under
149	Whately	2.1 pCi/L	0.5× under
150	Bellingham	2.0 pCi/L	0.5× under
151	Acton	2.0 pCi/L	0.5× under
152	Paxton	2.0 pCi/L	0.5× under
153	Winchester	2.0 pCi/L	0.5× under
154	Lenox	2.0 pCi/L	0.5× under
155	North Andover	2.0 pCi/L	0.5× under
156	Norton Center	2.0 pCi/L	0.5× under
157	Methuen	2.0 pCi/L	0.5× under
158	Ashland	2.0 pCi/L	0.5× under
159	Clinton	2.0 pCi/L	0.5× under
160	Kingston	2.0 pCi/L	0.5× under
161	Rehoboth	2.0 pCi/L	0.5× under
162	Pinehurst	1.9 pCi/L	0.5× under
163	Norton	1.9 pCi/L	0.5× under
164	Tewksbury	1.9 pCi/L	0.5× under
165	Hanson	1.9 pCi/L	0.5× under
166	Holyoke	1.9 pCi/L	0.5× under
167	Sagamore	1.9 pCi/L	0.5× under
168	Weston	1.9 pCi/L	0.5× under
169	Mashpee	1.9 pCi/L	0.5× under
170	Raynham	1.9 pCi/L	0.5× under
171	Sherborn	1.9 pCi/L	0.5× under
172	Medway	1.9 pCi/L	0.5× under
173	Dover	1.9 pCi/L	0.5× under
174	Groton	1.9 pCi/L	0.5× under
175	Belmont	1.8 pCi/L	0.5× under
176	Brewster	1.8 pCi/L	0.5× under
177	Norfolk	1.8 pCi/L	0.5× under
178	Peabody	1.8 pCi/L	0.5× under
179	Teaticket	1.8 pCi/L	0.5× under
180	Ayer	1.8 pCi/L	0.5× under
181	Easthampton	1.8 pCi/L	0.5× under
182	Sharon	1.8 pCi/L	0.5× under
183	Centerville	1.8 pCi/L	0.5× under
184	Rockport	1.8 pCi/L	0.4× under
185	Cohasset	1.8 pCi/L	0.4× under
186	East Falmouth	1.8 pCi/L	0.4× under
187	Needham	1.8 pCi/L	0.4× under
188	Waltham	1.8 pCi/L	0.4× under
189	Middleton	1.8 pCi/L	0.4× under
190	Weymouth	1.8 pCi/L	0.4× under
191	Ludlow	1.8 pCi/L	0.4× under
192	Amherst Center	1.7 pCi/L	0.4× under
193	Jamaica Plain	1.7 pCi/L	0.4× under
194	Princeton	1.7 pCi/L	0.4× under
195	Wellesley	1.7 pCi/L	0.4× under
196	Millis-Clicquot	1.7 pCi/L	0.4× under
197	Swampscott	1.7 pCi/L	0.4× under
198	Concord	1.7 pCi/L	0.4× under
199	Granby	1.7 pCi/L	0.4× under
200	Newton	1.7 pCi/L	0.4× under
201	Pittsfield	1.7 pCi/L	0.4× under
202	Chicopee	1.7 pCi/L	0.4× under
203	Wrentham	1.7 pCi/L	0.4× under
204	Burlington	1.6 pCi/L	0.4× under
205	Plainville	1.6 pCi/L	0.4× under
206	Marstons Mills	1.6 pCi/L	0.4× under
207	Lowell	1.6 pCi/L	0.4× under
208	Medford	1.6 pCi/L	0.4× under
209	West Barnstable	1.6 pCi/L	0.4× under
210	Bliss Corner	1.6 pCi/L	0.4× under
211	Essex	1.6 pCi/L	0.4× under
212	Millis	1.6 pCi/L	0.4× under
213	Cordaville	1.6 pCi/L	0.4× under
214	North Adams	1.6 pCi/L	0.4× under
215	Marblehead	1.6 pCi/L	0.4× under
216	Sutton	1.5 pCi/L	0.4× under
217	Canton	1.5 pCi/L	0.4× under
218	Northampton	1.5 pCi/L	0.4× under
219	Ocean Grove	1.5 pCi/L	0.4× under
220	South Boston	1.5 pCi/L	0.4× under
221	Chelsea	1.5 pCi/L	0.4× under
222	Brookline	1.5 pCi/L	0.4× under
223	Scituate	1.5 pCi/L	0.4× under
224	Arlington	1.4 pCi/L	0.4× under
225	Somerville	1.4 pCi/L	0.4× under
226	Marshfield Hills	1.4 pCi/L	0.4× under
227	North Lakeville	1.4 pCi/L	0.4× under
228	Malden	1.4 pCi/L	0.4× under
229	North Amherst	1.4 pCi/L	0.4× under
230	North Seekonk	1.4 pCi/L	0.3× under
231	Walpole	1.4 pCi/L	0.3× under
232	Hopedale	1.4 pCi/L	0.3× under
233	Pocasset	1.4 pCi/L	0.3× under
234	Randolph	1.3 pCi/L	0.3× under
235	Marion	1.3 pCi/L	0.3× under
236	Marshfield	1.3 pCi/L	0.3× under
237	Watertown	1.3 pCi/L	0.3× under
238	East Longmeadow	1.3 pCi/L	0.3× under
239	Chatham	1.3 pCi/L	0.3× under
240	Shirley	1.3 pCi/L	0.3× under
241	North Pembroke	1.2 pCi/L	0.3× under
242	Swansea	1.2 pCi/L	0.3× under
243	West Springfield	1.2 pCi/L	0.3× under
244	North Scituate	1.2 pCi/L	0.3× under
245	Belchertown	1.2 pCi/L	0.3× under
246	Cambridge	1.2 pCi/L	0.3× under
247	Yarmouth	1.2 pCi/L	0.3× under
248	Edgartown	1.1 pCi/L	0.3× under
249	Bedford	1.1 pCi/L	0.3× under
250	Middleborough Center	1.1 pCi/L	0.3× under
251	Revere	1.1 pCi/L	0.3× under
252	Southbridge	1.1 pCi/L	0.3× under
253	Fairhaven	1.1 pCi/L	0.3× under
254	Quincy	1.1 pCi/L	0.3× under
255	Winthrop	1.1 pCi/L	0.3× under
256	Longmeadow	1.1 pCi/L	0.3× under
257	Milford	1.1 pCi/L	0.3× under
258	Everett	1.0 pCi/L	0.3× under
259	Somerset	1.0 pCi/L	0.3× under
260	New Bedford	1.0 pCi/L	0.2× under
261	Mendon	0.9 pCi/L	0.2× under
262	Taunton	0.9 pCi/L	0.2× under
263	South Yarmouth	0.9 pCi/L	0.2× under
264	South Deerfield	0.8 pCi/L	0.2× under
265	Athol	0.8 pCi/L	0.2× under
266	Orleans	0.8 pCi/L	0.2× under
267	Gardner	0.8 pCi/L	0.2× under
268	Whitman	0.8 pCi/L	0.2× under
269	Boston	0.7 pCi/L	0.2× under
270	Springfield	0.6 pCi/L	0.2× under
271	Becket	0.4 pCi/L	0.1× under
272	Wellfleet	0.3 pCi/L	0.1× under

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