The radon galleries of Nordenau with an air temperature of about 8 degrees Celsius and a humidity of nearly 100%, have a positive effect on lung diseases, pollen allergies and many other diseases, amongst others sleep apnea. Photo: Aug. 23, 2014.

- Image ID: E7GA9B
The radon galleries of Nordenau with an air temperature of about 8 degrees Celsius and a humidity of nearly 100%, have a positive effect on lung diseases, pollen allergies and many other diseases, amongst others sleep apnea. Photo: Aug. 23, 2014.
dpa picture alliance / Alamy Stock Photo
Image ID: E7GA9B

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