Radon Levels by State

Map

Table

Introduction

Radon is a natural, odorless, colorless, tasteless, radioactive gas. Radon is most commonly found in uranium coated materials in the ground, therefore accumulating in subterranean areas such as basements and is emitted from the decay of uranium. It can also occur in some groundwater and hot springs. Climate change may cause previously trapped Radon underground to be released as permafrost thaws, especially in areas like Alaska, Canada, the Arctic, Greenland, and Russia.

Epidemiological studies have found that Radon can  cause cancer (it is the second-most cause of lung cancer, after smoking). Radon poisoning can lay dormant, showing no symptoms, for years. The United States Environmental Protection Agency (EPA) estimates one third of homes have radon levels greater than the recommended level (4.0 picocurie per liter).

See for yourself how radon levels change by state by surveying the data in the charts.

#StateRadon LevelAverage Daily UV Irradiance
1Alaska10.7 pCi/L
2South Dakota9.6 pCi/L2,268 J/m²
3Pennsylvania8.6 pCi/L2,249 J/m²
4Ohio7.8 pCi/L2,351 J/m²
5Washington7.5 pCi/L2,088 J/m²
6Kentucky7.4 pCi/L2,711 J/m²
7Montana7.4 pCi/L2,174 J/m²
8Idaho7.3 pCi/L2,551 J/m²
9Colorado6.8 pCi/L3,535 J/m²
10Iowa6.1 pCi/L2,375 J/m²
11West Virginia6.1 pCi/L2,527 J/m²
12North Dakota6 pCi/L1,987 J/m²
13Maine5.9 pCi/L1,944 J/m²
14Wisconsin5.7 pCi/L2,098 J/m²
15New Hampshire5.6 pCi/L2,107 J/m²
16Maryland5.4 pCi/L2,499 J/m²
17Illinois5.3 pCi/L2,506 J/m²
18Nebraska5.2 pCi/L2,576 J/m²
19Wyoming5 pCi/L2,794 J/m²
20Kansas4.9 pCi/L2,892 J/m²
21Tennessee4.8 pCi/L2,910 J/m²
22Indiana4.7 pCi/L2,427 J/m²
23Minnesota4.6 pCi/L2,076 J/m²
24New Jersey4.4 pCi/L2,372 J/m²
25Utah4.4 pCi/L3,191 J/m²
26Missouri4.3 pCi/L2,658 J/m²
27Rhode Island4.3 pCi/L2,210 J/m²
28New York4.2 pCi/L2,140 J/m²
29North Carolina4 pCi/L2,968 J/m²
30Alabama3.9 pCi/L3,225 J/m²
31Massachusetts3.9 pCi/L2,220 J/m²
32New Mexico3.9 pCi/L3,723 J/m²
33Vermont3.7 pCi/L2,004 J/m²
34Virginia3.6 pCi/L2,710 J/m²
35Michigan3.5 pCi/L2,045 J/m²
36Connecticut3.4 pCi/L2,262 J/m²
37Nevada3.4 pCi/L3,197 J/m²
38Oregon3.1 pCi/L2,399 J/m²
39Arkansas2.5 pCi/L3,031 J/m²
40Oklahoma2.5 pCi/L3,099 J/m²
41Delaware2.4 pCi/L2,505 J/m²
42South Carolina2.4 pCi/L3,179 J/m²
43California2.3 pCi/L3,216 J/m²
44Georgia2.3 pCi/L3,277 J/m²
45Texas2.1 pCi/L3,538 J/m²
46Arizona1.9 pCi/L3,728 J/m²
47Florida1.8 pCi/L3,636 J/m²
48Mississippi1.2 pCi/L3,221 J/m²
49Louisiana1.1 pCi/L3,346 J/m²
50Hawaii0 pCi/L

Radon Level by State

Alabama

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Radon Level

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3.9 pCi/L

Ranked in the US

#30

Average Daily UV Irradiance

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3,225 J/m²

Ranked in the US

#8

Radon Level

Average Daily UV Irradiance

Alaska

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10.7 pCi/L

Ranked in the US

#1

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Arizona

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1.9 pCi/L

Ranked in the US

#46

Average Daily UV Irradiance

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3,728 J/m²

Ranked in the US

#1

Radon Level

Average Daily UV Irradiance

Arkansas

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2.5 pCi/L

Ranked in the US

#39

Average Daily UV Irradiance

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3,031 J/m²

Ranked in the US

#15

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Average Daily UV Irradiance

California

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2.3 pCi/L

Ranked in the US

#43

Average Daily UV Irradiance

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3,216 J/m²

Ranked in the US

#10

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Average Daily UV Irradiance

Colorado

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6.8 pCi/L

Ranked in the US

#9

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3,535 J/m²

Ranked in the US

#5

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Average Daily UV Irradiance

Connecticut

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3.4 pCi/L

Ranked in the US

#36

Average Daily UV Irradiance

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2,262 J/m²

Ranked in the US

#36

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Average Daily UV Irradiance

Delaware

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2.4 pCi/L

Ranked in the US

#41

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2,505 J/m²

Ranked in the US

#27

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Average Daily UV Irradiance

Florida

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1.8 pCi/L

Ranked in the US

#47

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3,636 J/m²

Ranked in the US

#3

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Georgia

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2.3 pCi/L

Ranked in the US

#44

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3,277 J/m²

Ranked in the US

#7

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Hawaii

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0 pCi/L

Ranked in the US

#50

Radon Level

Idaho

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7.3 pCi/L

Ranked in the US

#8

Average Daily UV Irradiance

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2,551 J/m²

Ranked in the US

#24

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Average Daily UV Irradiance

Illinois

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5.3 pCi/L

Ranked in the US

#17

Average Daily UV Irradiance

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2,506 J/m²

Ranked in the US

#26

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Average Daily UV Irradiance

Indiana

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4.7 pCi/L

Ranked in the US

#22

Average Daily UV Irradiance

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2,427 J/m²

Ranked in the US

#30

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Average Daily UV Irradiance

Iowa

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6.1 pCi/L

Ranked in the US

#10

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2,375 J/m²

Ranked in the US

#32

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Kansas

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4.9 pCi/L

Ranked in the US

#20

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2,892 J/m²

Ranked in the US

#18

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Kentucky

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7.4 pCi/L

Ranked in the US

#6

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2,711 J/m²

Ranked in the US

#20

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Louisiana

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1.1 pCi/L

Ranked in the US

#49

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3,346 J/m²

Ranked in the US

#6

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Maine

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5.9 pCi/L

Ranked in the US

#13

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1,944 J/m²

Ranked in the US

#49

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Maryland

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5.4 pCi/L

Ranked in the US

#16

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2,499 J/m²

Ranked in the US

#28

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Massachusetts

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3.9 pCi/L

Ranked in the US

#31

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2,220 J/m²

Ranked in the US

#38

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Michigan

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3.5 pCi/L

Ranked in the US

#35

Average Daily UV Irradiance

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2,045 J/m²

Ranked in the US

#46

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Minnesota

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4.6 pCi/L

Ranked in the US

#23

Average Daily UV Irradiance

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2,076 J/m²

Ranked in the US

#45

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Mississippi

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1.2 pCi/L

Ranked in the US

#48

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3,221 J/m²

Ranked in the US

#9

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Missouri

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4.3 pCi/L

Ranked in the US

#26

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2,658 J/m²

Ranked in the US

#22

Radon Level

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Montana

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7.4 pCi/L

Ranked in the US

#7

Average Daily UV Irradiance

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2,174 J/m²

Ranked in the US

#40

Radon Level

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Nebraska

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5.2 pCi/L

Ranked in the US

#18

Average Daily UV Irradiance

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2,576 J/m²

Ranked in the US

#23

Radon Level

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Nevada

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3.4 pCi/L

Ranked in the US

#37

Average Daily UV Irradiance

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3,197 J/m²

Ranked in the US

#11

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New Hampshire

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5.6 pCi/L

Ranked in the US

#15

Average Daily UV Irradiance

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2,107 J/m²

Ranked in the US

#42

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New Jersey

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4.4 pCi/L

Ranked in the US

#24

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2,372 J/m²

Ranked in the US

#33

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New Mexico

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3.9 pCi/L

Ranked in the US

#32

Average Daily UV Irradiance

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3,723 J/m²

Ranked in the US

#2

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New York

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4.2 pCi/L

Ranked in the US

#28

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2,140 J/m²

Ranked in the US

#41

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North Carolina

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4 pCi/L

Ranked in the US

#29

Average Daily UV Irradiance

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2,968 J/m²

Ranked in the US

#16

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North Dakota

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6 pCi/L

Ranked in the US

#12

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1,987 J/m²

Ranked in the US

#48

Radon Level

Average Daily UV Irradiance

Ohio

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7.8 pCi/L

Ranked in the US

#4

Average Daily UV Irradiance

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2,351 J/m²

Ranked in the US

#34

Radon Level

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Oklahoma

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2.5 pCi/L

Ranked in the US

#40

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3,099 J/m²

Ranked in the US

#14

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Oregon

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3.1 pCi/L

Ranked in the US

#38

Average Daily UV Irradiance

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2,399 J/m²

Ranked in the US

#31

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Average Daily UV Irradiance

Pennsylvania

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8.6 pCi/L

Ranked in the US

#3

Average Daily UV Irradiance

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2,249 J/m²

Ranked in the US

#37

Radon Level

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Rhode Island

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4.3 pCi/L

Ranked in the US

#27

Average Daily UV Irradiance

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2,210 J/m²

Ranked in the US

#39

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Average Daily UV Irradiance

South Carolina

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2.4 pCi/L

Ranked in the US

#42

Average Daily UV Irradiance

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3,179 J/m²

Ranked in the US

#13

Radon Level

Average Daily UV Irradiance

South Dakota

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9.6 pCi/L

Ranked in the US

#2

Average Daily UV Irradiance

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2,268 J/m²

Ranked in the US

#35

Radon Level

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Tennessee

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4.8 pCi/L

Ranked in the US

#21

Average Daily UV Irradiance

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2,910 J/m²

Ranked in the US

#17

Radon Level

Average Daily UV Irradiance

Texas

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2.1 pCi/L

Ranked in the US

#45

Average Daily UV Irradiance

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3,538 J/m²

Ranked in the US

#4

Radon Level

Average Daily UV Irradiance

Utah

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4.4 pCi/L

Ranked in the US

#25

Average Daily UV Irradiance

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3,191 J/m²

Ranked in the US

#12

Radon Level

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Vermont

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3.7 pCi/L

Ranked in the US

#33

Average Daily UV Irradiance

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2,004 J/m²

Ranked in the US

#47

Radon Level

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Virginia

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3.6 pCi/L

Ranked in the US

#34

Average Daily UV Irradiance

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2,710 J/m²

Ranked in the US

#21

Radon Level

Average Daily UV Irradiance

Washington

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7.5 pCi/L

Ranked in the US

#5

Average Daily UV Irradiance

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2,088 J/m²

Ranked in the US

#44

Radon Level

Average Daily UV Irradiance

West Virginia

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6.1 pCi/L

Ranked in the US

#11

Average Daily UV Irradiance

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2,527 J/m²

Ranked in the US

#25

Radon Level

Average Daily UV Irradiance

Wisconsin

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5.7 pCi/L

Ranked in the US

#14

Average Daily UV Irradiance

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2,098 J/m²

Ranked in the US

#43

Radon Level

Average Daily UV Irradiance

Wyoming

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5 pCi/L

Ranked in the US

#19

Average Daily UV Irradiance

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2,794 J/m²

Ranked in the US

#19

Radon Level

Average Daily UV Irradiance