Radon Levels by State

Alaska has the highest radon levels in the US with 10.7 pCi/L. The state's geological composition, including uranium-rich rock formations and extensive granite deposits, contributes to the elevated radon levels.

Colorado has the ninth highest radon levels in the US with 6.8 pCi/L. The state's elevated radon levels are influenced by its geology, which includes a significant amount of uranium-rich rocks like granite and shale.

Idaho has the eighth highest radon levels in the US with 7.3 pCi/L. The state's high radon levels are primarily due to its geology, as Idaho has abundant granite and volcanic rock formations that contain uranium, leading to increased radon gas levels.

Iowa has the tenth highest radon levels in the US with 6.1 pCi/L. The state's radon levels are primarily attributed to its geology, as Iowa has high concentrations of uranium-rich glacial deposits and sedimentary rocks that contribute to the release of radon gas.

Kentucky has the sixth highest radon levels in the US with 7.4 pCi/L. The state's high radon levels can be attributed to its geological composition, which includes soils and rock formations rich in uranium. Kentucky also has a long history of coal mining, and the presence of coal deposits and associated rocks can release radon gas into the surrounding environment.

Montana also has the sixth highest radon levels in the US with 7.4 pCi/L. The state's radon levels are primarily influenced by its geology, which includes rocks such as granite and shale that contain uranium. Montana's mountainous terrain and geological diversity contribute to the presence of uranium-rich formations, increasing the likelihood of elevated radon levels.

Ohio has the fourth highest radon levels in the US with 7.8 pCi/L. The state's high radon levels are linked to its geology, specifically the prevalence of glacial deposits that contain radon-producing minerals like uranium and thorium.

Pennsylvania has the third highest radon levels in the US with 8.6 pCi/L. The state's radon levels are elevated due to its geology, specifically the presence of uranium and radium in the bedrock, which results in the release of radon gas into the soil and subsequently into homes and structures.

South Dakota holds the second highest radon levels with 9.6 pCi/L. The state's geology, characterized by granite and shale formations, plays a significant role in the high radon concentrations found in homes and buildings.

Washington has the fifth highest radon levels in the US with 7.5 pCi/L. The state's radon levels can be attributed to its diverse geology, including granitic rocks, which can release radon gas as they naturally decay over time.