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HEALTH RISKS

Radon gas decays into radioactive particles that get trapped in your lungs. These particles release small bursts of energy that can damage lung tissue. Not everyone exposed will develop lung cancer. The time between exposure and the onset of the disease may be many years. There is some uncertainty about the magnitude of radon health risks yet we know more about radon risks than risks from most other cancer-causing substances.

Your chances of getting lung cancer from radon depends mostly on:

  • How much radon is in your home
  • The amount of time you spend in your home
  • Whether you are a smoker or have ever smoked

TWO EPA HEALTH RISK CHARTS
1) If you smoke
2) If you've never smoked
from EPA's 2004 Citizen's Guide To Radon

Radon Risk If You Smoke

  Radon Level

  If 1,000 people who smoked were exposed to this level over a lifetime. .

  The risk of cancer from radon exposure compares to . . .

  WHAT TO DO:

Stop smoking and . .

 20 pCi/L

 about 260 people could get lung cancer

  250 times the risk of drowning

  Fix your home

 10 pCi/L

  about 150 people could get lung cancer

  200 times the risk of dying in a home fire.

  Fix your home

 8 pCi/L

  about 120 people could get lung cancer

 30 times the risk of dying in a fall.

  Fix your home

 4 pCi/L

 about 62 people could get lung cancer

5 times the risk of dying in an car crash

  Fix your home

 2 pCi/L

 about 32 people could get lung cancer

  6 times the risk of dying from poison

 Consider fixing between 2 and 4 pCi/L

 (Reducing levels below 2 pCi/L is difficult)

 1.3 pCi/L

 about 20 people could get lung cancer

  Average indoor radon levels

 0.4 pCi/L

 

  Average outdoor radon levels

Note: If you are a former smoker, your risk may be lower.

Radon Risk If You've Never Smoked

  Radon Level

  If 1,000 people who smoked were exposed to this level over a lifetime. .

  The risk of cancer from radon exposure compares to . . .

  WHAT TO DO:

 20 pCi/L

 about 36 people could get lung cancer

35 times the risk of drowning

  Fix your home

 10 pCi/L

  about 18 people could get lung cancer

 20 times the risk of dying in a home fire

  Fix your home

 8 pCi/L

  about 15 people could get lung cancer

 4 times the risk of dying in a fall.

  Fix your home

 4 pCi/L

 about 7 people could get lung cancer

The risk of dying in an car crash

  Fix your home

 2 pCi/L

about 4 person could get lung cancer

  The risk of dying from poison

 Consider fixing between 2 and 4 pCi/L

 (Reducing levels below 2 pCi/L is difficult)

 1.3 pCi/L

Less than 2 person could get lung cancer

  Average indoor radon levels

 0.4 pCi/L

  Average outdoor radon levels

Note: If you are a former smoker, your risk may be higher.

*Lifetime risk of lung cancer deaths from EPA Assessment of Risks from Radon in Homes (EPA 402-R-03-003).

**Comparison data calculated using the Centers for Disease Control and Prevention’s 1999-2001 National Center for Injury Prevention and Control Reports.

From EPA's Citizen's Guide To Radon
U.S. EPA 402-K02-006, Revised May 2004

Citizens Guide