High concentrations of radon at workplaces can be predicted based on earlier radon measurements made in apartments and workplaces.

According to section 155 of the Radiation Act, radon concentration at workplaces must be determined in areas where more than 10 per cent of the radon concentrations measured earlier in apartments, other living areas and workplaces exceeds the value of 300 Bq/m³. Attached is a list of all such areas.

The list has been updated in December 2018. The list includes those areas in which ten or more measurements have been made. Notice that there are both municipalities and separate postal code areas where radon measurements at workplaces are obligatory.

Municipality	Buildings measured	Average Bq/m3	Proportion (%) exceeding 300 Bq/m³
Akaa	592	194	15,7
Asikkala	807	312	24,8
Askola	570	491	37,7
Enontekiö	146	258	22,6
Espoo	5739	159	12,2
Forssa	422	181	13,5
Hamina	1322	273	26,9
Hattula	593	230	19,9
Hausjärvi	862	282	29,2
Heinola	1364	269	26,6
Helsinki	4432	155	11,2
Hollola	3469	456	46,0
Huittinen	175	156	10,9
Humppila	190	371	27,9
Hyvinkää	2406	267	21,7
Hämeenlinna	3321	235	22,4
Iitti	467	294	25,9
Imatra	940	231	20,6
Janakkala	1903	340	26,1
Joensuu	1862	191	12,4
Jokioinen	261	203	17,2
Joutsa	298	219	16,8
Jyväskylä	2561	165	10,8
Järvenpää	1953	242	25,9
Kajaani	933	387	24,9
Kangasala	2028	283	25,7
Karkkila	344	164	12,2
Kauniainen	593	208	22,1
Kemijärvi	260	226	16,2
Kerava	829	198	18,5
Kirkkonummi	1883	172	13,0
Kitee	557	245	19,4
Kivijärvi	49	238	12,2
Kolari	167	308	25,7
Kotka	3264	332	40,5
Kouvola	5227	309	34,0
Kuhmoinen	218	265	27,5
Kärkölä	612	380	42,0
Lahti	5655	442	39,3
Laitila	135	150	10,4
Lapinjärvi	376	419	41,0
Lappeenranta	2420	199	16,2
Laukaa	577	185	13,0
Lemi	174	260	26,4
Lempäälä	1191	271	28,1
Liperi	518	186	11,2
Lohja	1209	164	11,0
Loppi	775	281	22,7
Loviisa	2288	508	46,3
Luhanka	61	229	23,0
Luumäki	472	322	41,3
Maarianhamina	168	176	14,9
Miehikkälä	167	306	32,3
Myrskylä	257	430	39,3
Mäntsälä	1061	307	30,4
Mäntyharju	315	175	12,7
Nokia	1545	250	26,5
Nurmes	191	218	13,6
Nurmijärvi	1461	212	16,0
Orimattila	1454	355	30,3
Orivesi	439	155	11,6
Outokumpu	237	189	12,7
Padasjoki	258	278	26,4
Parikkala	312	215	22,1
Parkano	136	143	10,3
Pirkkala	1119	197	20,7
Pornainen	470	246	23,4
Porvoo	2421	265	23,2
Pukkila	298	369	33,9
Punkalaidun	65	146	10,8
Pyhtää	566	454	43,6
Pyhäjärvi	106	187	14,2
Pälkäne	467	245	21,8
Riihimäki	1227	236	21,8
Ruokolahti	483	245	20,3
Ruovesi	295	364	18,3
Saarijärvi	341	175	11,4
Saltvik	24	146	29,2
Sastamala	620	161	11,1
Savitaipale	519	311	28,9
Sipoo	1165	169	13,6
Siuntio	237	171	11,0
Sodankylä	292	222	13,0
Somero	290	179	13,4
Suomussalmi	134	159	10,4
Sysmä	361	215	18,6
Taipalsaari	1020	469	48,4
Tammela	340	292	21,5
Tampere	6490	366	28,3
Tohmajärvi	227	230	14,5
Toivakka	93	162	14,0
Tuusula	1366	194	17,3
Utsjoki	50	148	12,0
Valkeakoski	691	213	17,7
Valtimo	129	227	15,5
Vantaa	4316	180	15,3
Vesilahti	207	154	11,6
Virolahti	229	282	31,0
Ylitornio	107	164	14,0
Ylöjärvi	2256	231	20,6
Ähtäri	61	161	13,1
Äänekoski	359	187	12,5

 

Postal code	Post office	Buildings measured	Average Bq/m3	Proportion exceeding 300 Bq/m³
03790	Vihtijärvi	28	203	21,4
10120	Tähtelä	26	161	11,5
10160	Degerby	53	140	11,3
10330	Pinjainen	18	263	16,7
10360	Mustio	54	218	24,1
10420	Pohjankuru	58	161	13,8
10440	Bollsta	16	115	12,5
10570	Bromarv	17	260	29,4
19430	Pertunmaa	33	157	12,1
20460	Turku	36	134	11,1
21290	Rusko	99	169	10,1
21540	Preitilä	19	157	15,8
21870	Riihikoski	36	155	11,1
23100	Mynämäki	249	177	11,2
23200	Vinkkilä	28	144	10,7
23500	Uusikaupunki	76	195	11,8
23600	Kalanti	18	179	22,2
25320	Raatala	11	155	18,2
25410	Suomusjärvi	20	309	20,0
29340	Kullaa	17	146	11,8
29600	Noormarkku	89	127	12,4
31720	Urjalankylä	19	142	10,5
31760	Urjala	50	180	12,0
32270	Metsämaa	23	169	17,4
32410	Niinijoki	15	159	13,3
35540	Juupajoki	16	174	12,5
38950	Honkajoki	12	131	16,7
39130	Sasi	41	193	19,5
39170	Jumesniemi	10	252	20,0
40930	Kinkomaa	43	173	14,0
41230	Uurainen	23	197	13,0
41290	Kangashäkki	31	177	12,9
41490	Niemisjärvi	33	162	18,2
42220	Kaipola	23	141	13,0
44880	Muurasjärvi	11	129	18,2
50100	Mikkeli	138	175	10,1
52230	Hurissalo	10	160	20,0
57210	Savonlinna	18	156	11,1
60320	Seinäjoki	26	386	19,2
60510	Hyllykallio	41	126	12,2
66300	Jurva	55	141	10,9
72400	Pielavesi	29	127	13,8
77570	Jäppilä	19	121	10,5
78200	Varkaus	13	150	15,4
80130	Joensuu	23	681	21,7
80510	Onttola	117	154	10,3
80780	Kontioniemi	66	236	25,8
81235	Lehtoi	50	211	16,0
82830	Haukivaara	11	214	18,2
85160	Rautio	18	153	16,7
96400	Rovaniemi	39	240	17,9
96500	Rovaniemi	20	151	20,0
96900	Saarenkylä	65	276	15,4