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Relative Risks for Radon and Lung Cancer*
Exposure Level in pCi/L Lung Cancer
Excess Deaths/1000
Comparable
Lung Cancer Risk
  >100 200+ Uranium miner of the 1960's
Maximum permissible in mines now 65 140-400 3-4 packs/day, 50 years
Long-terms accumulation 20 45-180 1.5 packs/day, 50 years
EPA Action Level 10 22-90 Light smoker
Average indoor level 4 10-45 150 chest X-rays/year
Average outdoor 1.5 3-16 Passive smoking
Fertile woman (with respect to fetus) 0.2 0.8-2 15 Chest X-rays/year
*Adapted from A Citizens Giude to Radon. Numerical risks values were reduced by 25%.
The maximum permissible value for miners appears high because they are exposed only 40 hours per week