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Parts of Gloucestershire are hotspots for radioactive gas radon

People warned of the dangers of radon Credit: ITV News

A public health campaign is underway this week to alert people to the dangers of radon.

The naturally occurring gas is the second leading cause of lung cancer after smoking.

The Forest of Dean, the Cotswolds and Cheltenham are radon hotspots - but homes can be protected.

There are also hotspots in Devon and Cornwall.

Maps showing the areas most at risk from high levels of radon Credit: ukradon.org