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Radon prevention, measurement and mitigation activities have been increasing in Finland during the 2000s. Nowadays, many municipal authorities, especially those located in high-radon areas, require radon prevention measures. This has activated radon measurements. Owners of new houses having radon piping installed under the floor slab are the most active group to measure and reduce the found high-radon values. Their radon awareness is apparently better than on the average, and the existing piping makes it easier and cheaper to reduce the radon levels. Local campaigns involving invitation flyers mailed to the residents have been a cost-effective means to activate measurements of older houses. So far 116 611 dwellings in low-rise residential buildings have been measured. At least 15 % of the 16 860 dwellings found to exceed the reference level of 400 Bq m −3  had their indoor radon level reduced below that.

Radon measurement and mitigation activity in Finland