200

1000 times average ^

average indoor level

1000 times average ^

average indoor level outdoor level

100 times

Comparable Risk (Based on lifetime exposure)

More than 75 times ► nonsmoker risk of dying from lung cancer

4-pack-a-day smoker

10,000 chest X rays per year

30 times nonsmokers risk of dying from lung cancer

10 times ^ average outdoor level

10 times ^ average indoor level

10 times ^ average outdoor level

Average ^ indoor level

0.001 Average ^ outdoor level

^ 2-pack-a-day smoker

^ 1-pack-a-day smoker

^ 3 times nonsmoker risk of dying from lung cancer

^ 200 chest X rays per year

^ Nonsmoker risk of dying from lung cancer

FIG. 5.28.2 Radon risk evaluation chart. This chart shows how the lung cancer risks of radon exposure compare to other causes of the disease. For example, breathing 20 pCi/l poses about the same lung cancer risk as smoking two packs of cigarettes a day. (Reprinted from U.S. Environmental Protection Agency.)

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