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Radon has been present on earth for millions of years. Caused by the natural decay of tiny amounts of radioactive elements (such as Uranium and Thorium) that can be found in all rocks and soils underneath us, Radon is a naturally occurring radioactive gas that is present to differing levels throughout the UK.
Undetectable without specialist testing, Radon is colourless, odourless and tasteless and can only be detected using specialist radon detectors which measure the amount of Radon present in the air.
In the UK, it is measured in becquerels per cubic metre of air (Bq/m3) with Radon levels varying according to geographical location and several other factors.
Radon levels can vary both over time and according to location, varying hourly, daily, weekly and through the ever-changing seasons. Several factors contribute to the varying levels, including temperature, soil gas pressure and ventilation.
In Radon hot spots, the levels will increase when air pressure within a property is lower than the pressure within the soil, as this causes a suction effect which draws more gas from the soil into the building.