This data is particularly important if you live in the US but also if you have any sort of digestive issue. Apparently as background radiation in the atmosphere rises, so do digestive complaints.
http://www.agreenroadjournal.com/2014/01/us-medical-doctor-finds-elevated-levels.html
http://www.agreenroadjournal.com/2014/01/us-medical-doctor-finds-elevated-levels.html