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 271 cities.

Updated September 28, 2026

Highest city

19.1pCi/L

East Douglas

Massachusetts city average

2.4pCi/L

across 271 cities

Above action level

21/ 271

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	7.3 pCi/L	1.8× over
3	Leicester	6.3 pCi/L	1.6× over
4	Ashburnham	6.0 pCi/L	1.5× over
5	Lanesborough	5.5 pCi/L	1.4× over
6	Northbridge	5.3 pCi/L	1.3× over
7	Merrimac	5.2 pCi/L	1.3× over
8	Upton	5.1 pCi/L	1.3× over
9	Dudley	5.0 pCi/L	1.3× over
10	Beverly Cove	4.8 pCi/L	1.2× over
11	Fall River	4.5 pCi/L	1.1× over
12	Ipswich	4.3 pCi/L	1.1× over
13	Assonet	4.2 pCi/L	1.1× over
14	Boylston	4.2 pCi/L	1.1× over
15	Auburn	4.2 pCi/L	1.1× over
16	Harwich Center	4.2 pCi/L	1.1× over
17	North Westport	4.2 pCi/L	1.0× over
18	Beverly	4.2 pCi/L	1.0× over
19	Amesbury	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
✓ Below EPA action level (4 pCi/L)
22	Boxford	3.9 pCi/L	1.0× under
23	Chelmsford	3.9 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	Lunenburg	3.8 pCi/L	1.0× under
28	Duxbury	3.8 pCi/L	1.0× under
29	Bolton	3.8 pCi/L	0.9× under
30	Carver	3.8 pCi/L	0.9× under
31	Topsfield	3.7 pCi/L	0.9× under
32	Webster	3.7 pCi/L	0.9× under
33	Housatonic	3.7 pCi/L	0.9× under
34	West Boylston	3.7 pCi/L	0.9× under
35	Smith Mills	3.6 pCi/L	0.9× under
36	Braintree	3.6 pCi/L	0.9× under
37	Falmouth	3.6 pCi/L	0.9× under
38	Wilbraham	3.5 pCi/L	0.9× under
39	Dracut	3.5 pCi/L	0.9× under
40	Lynnfield	3.5 pCi/L	0.9× under
41	Harvard	3.5 pCi/L	0.9× under
42	Dunstable	3.4 pCi/L	0.9× under
43	South Peabody	3.4 pCi/L	0.9× under
44	Freetown	3.4 pCi/L	0.8× under
45	Shrewsbury	3.4 pCi/L	0.8× under
46	Grafton	3.3 pCi/L	0.8× under
47	West Newbury	3.3 pCi/L	0.8× under
48	Billerica	3.2 pCi/L	0.8× under
49	Littleton Common	3.2 pCi/L	0.8× under
50	Gloucester	3.2 pCi/L	0.8× under
51	Dighton	3.2 pCi/L	0.8× under
52	Charlton	3.1 pCi/L	0.8× under
53	Acushnet Center	3.1 pCi/L	0.8× under
54	Ashfield	3.1 pCi/L	0.8× under
55	Westminster	3.1 pCi/L	0.8× under
56	Whitinsville	3.1 pCi/L	0.8× under
57	Leverett	3.0 pCi/L	0.7× under
58	Norwood	3.0 pCi/L	0.7× under
59	Andover	2.9 pCi/L	0.7× under
60	Newburyport	2.9 pCi/L	0.7× under
61	Fitchburg	2.8 pCi/L	0.7× under
62	West Concord	2.8 pCi/L	0.7× under
63	South Hadley	2.8 pCi/L	0.7× under
64	Westford	2.8 pCi/L	0.7× under
65	Lawrence	2.8 pCi/L	0.7× under
66	Sudbury	2.8 pCi/L	0.7× under
67	Millbury	2.8 pCi/L	0.7× under
68	Brockton	2.8 pCi/L	0.7× under
69	Greenfield	2.7 pCi/L	0.7× under
70	Groveland	2.7 pCi/L	0.7× under
71	Berkley	2.7 pCi/L	0.7× under
72	Saugus	2.7 pCi/L	0.7× under
73	Pepperell	2.7 pCi/L	0.7× under
74	Easton	2.7 pCi/L	0.7× under
75	Framingham	2.7 pCi/L	0.7× under
76	Hubbardston	2.7 pCi/L	0.7× under
77	Lincoln	2.7 pCi/L	0.7× under
78	Attleboro	2.7 pCi/L	0.7× under
79	Stoneham	2.6 pCi/L	0.7× under
80	Westwood	2.6 pCi/L	0.7× under
81	North Reading	2.6 pCi/L	0.7× under
82	Westborough	2.6 pCi/L	0.7× under
83	Worcester	2.6 pCi/L	0.7× under
84	Milton	2.6 pCi/L	0.7× under
85	Sunderland	2.6 pCi/L	0.7× under
86	Leominster	2.6 pCi/L	0.6× under
87	Natick	2.6 pCi/L	0.6× under
88	Woburn	2.6 pCi/L	0.6× under
89	Richmond	2.5 pCi/L	0.6× under
90	Cochituate	2.5 pCi/L	0.6× under
91	Stow	2.5 pCi/L	0.6× under
92	Mansfield Center	2.5 pCi/L	0.6× under
93	Southborough	2.5 pCi/L	0.6× under
94	Hampden	2.5 pCi/L	0.6× under
95	Reading	2.4 pCi/L	0.6× under
96	Hingham	2.4 pCi/L	0.6× under
97	Marlborough	2.4 pCi/L	0.6× under
98	Holbrook	2.4 pCi/L	0.6× under
99	Holden	2.4 pCi/L	0.6× under
100	Hudson	2.4 pCi/L	0.6× under
101	Wenham	2.4 pCi/L	0.6× under
102	White Island Shores	2.4 pCi/L	0.6× under
103	Framingham Center	2.4 pCi/L	0.6× under
104	Southampton	2.4 pCi/L	0.6× under
105	Sterling	2.3 pCi/L	0.6× under
106	Williamsburg	2.3 pCi/L	0.6× under
107	Norwell	2.3 pCi/L	0.6× under
108	Rowley	2.3 pCi/L	0.6× under
109	Uxbridge	2.3 pCi/L	0.6× under
110	Rutland	2.3 pCi/L	0.6× under
111	Sturbridge	2.3 pCi/L	0.6× under
112	Winchendon	2.3 pCi/L	0.6× under
113	Townsend	2.3 pCi/L	0.6× under
114	Wakefield	2.3 pCi/L	0.6× under
115	Melrose	2.3 pCi/L	0.6× under
116	West Tisbury	2.3 pCi/L	0.6× under
117	Plymouth	2.3 pCi/L	0.6× under
118	Dalton	2.3 pCi/L	0.6× under
119	Dedham	2.3 pCi/L	0.6× under
120	Haverhill	2.3 pCi/L	0.6× under
121	Great Barrington	2.3 pCi/L	0.6× under
122	Medfield	2.3 pCi/L	0.6× under
123	Southwick	2.3 pCi/L	0.6× under
124	Williamstown	2.3 pCi/L	0.6× under
125	Abington	2.2 pCi/L	0.6× under
126	South Amherst	2.2 pCi/L	0.6× under
127	Wilmington	2.2 pCi/L	0.6× under
128	Cotuit	2.2 pCi/L	0.6× under
129	Tyngsboro	2.2 pCi/L	0.6× under
130	Stoughton	2.2 pCi/L	0.6× under
131	South Duxbury	2.2 pCi/L	0.5× under
132	Wayland	2.2 pCi/L	0.5× under
133	Westfield	2.2 pCi/L	0.5× under
134	Lexington	2.1 pCi/L	0.5× under
135	North Falmouth	2.1 pCi/L	0.5× under
136	Foxborough	2.1 pCi/L	0.5× under
137	Franklin	2.1 pCi/L	0.5× under
138	Northborough	2.1 pCi/L	0.5× under
139	Maynard	2.1 pCi/L	0.5× under
140	Carlisle	2.1 pCi/L	0.5× under
141	Danvers	2.1 pCi/L	0.5× under
142	Salem	2.1 pCi/L	0.5× under
143	Rockland	2.1 pCi/L	0.5× under
144	Acton	2.0 pCi/L	0.5× under
145	Bellingham	2.0 pCi/L	0.5× under
146	Granville	2.0 pCi/L	0.5× under
147	Hopkinton	2.0 pCi/L	0.5× under
148	Paxton	2.0 pCi/L	0.5× under
149	Winchester	2.0 pCi/L	0.5× under
150	Lenox	2.0 pCi/L	0.5× under
151	Norton Center	2.0 pCi/L	0.5× under
152	Methuen	2.0 pCi/L	0.5× under
153	Clinton	2.0 pCi/L	0.5× under
154	Kingston	2.0 pCi/L	0.5× under
155	Ashland	2.0 pCi/L	0.5× under
156	Pinehurst	1.9 pCi/L	0.5× under
157	Tewksbury	1.9 pCi/L	0.5× under
158	Norton	1.9 pCi/L	0.5× under
159	Hanson	1.9 pCi/L	0.5× under
160	Holyoke	1.9 pCi/L	0.5× under
161	Sagamore	1.9 pCi/L	0.5× under
162	Mashpee	1.9 pCi/L	0.5× under
163	Raynham	1.9 pCi/L	0.5× under
164	Sherborn	1.9 pCi/L	0.5× under
165	Belmont	1.9 pCi/L	0.5× under
166	Medway	1.9 pCi/L	0.5× under
167	Rehoboth	1.9 pCi/L	0.5× under
168	Groton	1.9 pCi/L	0.5× under
169	Hanover	1.9 pCi/L	0.5× under
170	Brewster	1.8 pCi/L	0.5× under
171	Norfolk	1.8 pCi/L	0.5× under
172	Peabody	1.8 pCi/L	0.5× under
173	Weston	1.8 pCi/L	0.5× under
174	Ayer	1.8 pCi/L	0.5× under
175	Teaticket	1.8 pCi/L	0.5× under
176	Holliston	1.8 pCi/L	0.5× under
177	Needham	1.8 pCi/L	0.5× under
178	Easthampton	1.8 pCi/L	0.5× under
179	Sharon	1.8 pCi/L	0.5× under
180	Centerville	1.8 pCi/L	0.5× under
181	North Andover	1.8 pCi/L	0.5× under
182	Marstons Mills	1.8 pCi/L	0.4× under
183	Rockport	1.8 pCi/L	0.4× under
184	Waltham	1.8 pCi/L	0.4× under
185	Amherst Center	1.8 pCi/L	0.4× under
186	Middleton	1.8 pCi/L	0.4× under
187	Weymouth	1.8 pCi/L	0.4× under
188	East Falmouth	1.8 pCi/L	0.4× under
189	Ludlow	1.8 pCi/L	0.4× under
190	Princeton	1.8 pCi/L	0.4× under
191	Dover	1.8 pCi/L	0.4× under
192	Jamaica Plain	1.7 pCi/L	0.4× under
193	Millis-Clicquot	1.7 pCi/L	0.4× under
194	Newton	1.7 pCi/L	0.4× under
195	Wellesley	1.7 pCi/L	0.4× under
196	Granby	1.7 pCi/L	0.4× under
197	Agawam	1.7 pCi/L	0.4× under
198	Swampscott	1.7 pCi/L	0.4× under
199	Pittsfield	1.7 pCi/L	0.4× under
200	Chicopee	1.7 pCi/L	0.4× under
201	Concord	1.7 pCi/L	0.4× under
202	Wrentham	1.7 pCi/L	0.4× under
203	Plainville	1.7 pCi/L	0.4× under
204	Burlington	1.6 pCi/L	0.4× under
205	Medford	1.6 pCi/L	0.4× under
206	Essex	1.6 pCi/L	0.4× under
207	Lowell	1.6 pCi/L	0.4× under
208	West Barnstable	1.6 pCi/L	0.4× under
209	Cordaville	1.6 pCi/L	0.4× under
210	North Adams	1.6 pCi/L	0.4× under
211	Millis	1.6 pCi/L	0.4× under
212	Marblehead	1.5 pCi/L	0.4× under
213	Sutton	1.5 pCi/L	0.4× under
214	Canton	1.5 pCi/L	0.4× under
215	Northampton	1.5 pCi/L	0.4× under
216	Ocean Grove	1.5 pCi/L	0.4× under
217	South Boston	1.5 pCi/L	0.4× under
218	Chelsea	1.5 pCi/L	0.4× under
219	Bliss Corner	1.5 pCi/L	0.4× under
220	Brookline	1.5 pCi/L	0.4× under
221	Scituate	1.5 pCi/L	0.4× under
222	North Amherst	1.5 pCi/L	0.4× under
223	Arlington	1.4 pCi/L	0.4× under
224	Somerville	1.4 pCi/L	0.4× under
225	Marshfield Hills	1.4 pCi/L	0.4× under
226	North Lakeville	1.4 pCi/L	0.4× under
227	Cohasset	1.4 pCi/L	0.4× under
228	Malden	1.4 pCi/L	0.3× under
229	North Seekonk	1.4 pCi/L	0.3× under
230	Walpole	1.4 pCi/L	0.3× under
231	Hopedale	1.4 pCi/L	0.3× under
232	Pocasset	1.4 pCi/L	0.3× under
233	East Longmeadow	1.3 pCi/L	0.3× under
234	Marion	1.3 pCi/L	0.3× under
235	Marshfield	1.3 pCi/L	0.3× under
236	Watertown	1.3 pCi/L	0.3× under
237	Chatham	1.3 pCi/L	0.3× under
238	Randolph	1.2 pCi/L	0.3× under
239	North Pembroke	1.2 pCi/L	0.3× under
240	Swansea	1.2 pCi/L	0.3× under
241	North Scituate	1.2 pCi/L	0.3× under
242	Belchertown	1.2 pCi/L	0.3× under
243	Yarmouth	1.2 pCi/L	0.3× under
244	Cambridge	1.1 pCi/L	0.3× under
245	Edgartown	1.1 pCi/L	0.3× under
246	Shirley	1.1 pCi/L	0.3× under
247	Bedford	1.1 pCi/L	0.3× under
248	Middleborough Center	1.1 pCi/L	0.3× under
249	Revere	1.1 pCi/L	0.3× under
250	Southbridge	1.1 pCi/L	0.3× under
251	Fairhaven	1.1 pCi/L	0.3× under
252	Quincy	1.1 pCi/L	0.3× under
253	Winthrop	1.1 pCi/L	0.3× under
254	Longmeadow	1.1 pCi/L	0.3× under
255	Milford	1.1 pCi/L	0.3× under
256	West Springfield	1.1 pCi/L	0.3× under
257	Everett	1.0 pCi/L	0.3× under
258	Somerset	1.0 pCi/L	0.3× under
259	New Bedford	1.0 pCi/L	0.2× under
260	Mendon	0.9 pCi/L	0.2× under
261	Taunton	0.9 pCi/L	0.2× under
262	South Yarmouth	0.9 pCi/L	0.2× under
263	South Deerfield	0.8 pCi/L	0.2× under
264	Athol	0.8 pCi/L	0.2× under
265	Orleans	0.8 pCi/L	0.2× under
266	Gardner	0.8 pCi/L	0.2× under
267	Whitman	0.8 pCi/L	0.2× under
268	Boston	0.7 pCi/L	0.2× under
269	Springfield	0.6 pCi/L	0.2× under
270	Becket	0.4 pCi/L	0.1× under
271	Wellfleet	0.3 pCi/L	0.1× under

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