Radon is considered the second cause of lung cancer and the first in those who have never smoked. Lung cancer in those who have never smoked accounts for between 9 and 28% of all lung cancer cases. Long-term residential radon exposure has also been linked to an increased risk of primary brain tumours. It has been suggested that air pollution from traffic might enhance the effect of radon on the risk of childhood leukaemia.
Public Health England recommends that radon levels should be reduced in homes where the average is more than 200 becquerels per metre cubed (200 Bq m-3). Modern energy-efficient building construction technologies in combination with effective insulation reduce the air exchange rate and conditions for increased radon accumulation in indoor air are created. A study by the Health Protection Agency determined how effective radon remedial methods were over 15 years. The overall failure rate was 63%. The HPA advises that homes should be retested every 5-10 years.
With the Canary radon meter, all it takes is 24 hours per room to put your mind at rest, or to establish that remediation measures are needed, or old measures taken are no longer effective.