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While radon is present outdoors, it quickly dilutes to harmless levels. The concern is when radon enters buildings. It can seep in through cracks in the foundation, floors, and walls. In buildings with poor ventilation, radon can accumulate to high concentrations, especially in basements and lower levels.

The risk of radon exposure is higher in areas with higher levels of uranium in the underlying geology. Radon maps typically use darker colors to indicate areas with a greater likelihood of having buildings with high radon levels. However, it's important to remember that these maps: https://www.ukradon.org/information/ukmaps provide a general estimate. Even in high-risk areas, not all buildings will have elevated radon. Conversely, some buildings in low-risk areas might still have high radon levels.

The only way to know for sure if your building has a radon problem is to test it. Radon testing kits are widely available and relatively inexpensive.

Where is radon found?