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Radon in the Home

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April 19, 2007

According to the Surgeon General, radon is the second leading cause of lung cancer in the United States-second only to smoking. For non-smokers it ranks number one. You may not realize it, but you and your family are likely to get your greatest exposure to radon at home. In fact, the EPA estimates that 1 out of every 15 homes in the U.S has elevated levels of radon. Is yours one of them?

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What Is Radon?

Radon is a radioactive gas that is produced naturally when minerals like uranium and radium break down in the soil. As these minerals continuously break down in the environment, they release radiation. Outside air easily dilutes concentrations of radon gas. The danger occurs when radon levels build up indoors and people become exposed to these concentrated levels for extended periods of time.

Where Is Radon?

In nature, radon is everywhere-in soil, rocks, water, and in the air we breathe.Because radon gas occurs naturally as minerals decay, radon concentrations for any given geographic region are primarily dependant on the geologic makeup of the soil. Certain places, like mines, caves and water treatment plants, are more prone to seeing high levels of radon. How homes are built and operated can also affect radon levels.
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For example, people living in homes with basements that are used as living areas run a greater risk of exposure to elevated levels of radon than people living in homes without basements. Although concentrations vary from place to place, radon can be found everywhere in the United States and in just about every country around the world.

How Radon Gets Into Your Home

You can't see it, smell it or taste it, but that doesn't stop radon from entering your home and silently harming the health of your family. Because it's a gas, it moves easily through spaces in the soil or fill material around a home's foundation. Essentially, radon can enter your anywhere there is an opening between your home and the surrounding soil:

The highest levels of radon tend to be found in the lower levels of your home and can vary according to the season. This is because in certain climates, the lowest parts of the home tend to operate under negative pressure-especially during the heating season. This negative pressure creates a vacuum that acts to draw radon into the home. This vacuum can be caused by heated air rising; fireplaces, woodstoves and furnaces; air vented to the outside (clothes dryers, exhaust fans); or downwind drafts created as wind blows past your house. Upper levels of the home also tend to have a greater volume of diluted air due to open windows and doors, especially in warmer seasons.

How Radon Effects Your Health

Simply put, long-term exposure to elevated levels of radon can cause cancer. It causes an estimated 15,000 to 22,000 lung cancer deaths each year in the United States. Radon is a source of ionizing radiation, a known cancer-causing agent. Long-term exposure to high levels of radon harms the cells that make up our body's tissues and organs-often resulting in cancer.
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How You Can Protect Your Family

The only way to measure your family's risk of exposure to radon is to have you home tested. The tests are simple to perform, inexpensive and can be done in the privacy of your own home. Once you find out what the levels of radon are in your home, you can decide what level of exposure is acceptable to you and take steps to lower your exposure if necessary. Radon mitigation doesn't have to be expensive; it may be as simple as repairing cracks in your foundation, or making small adjustments to your heating or cooling systems.

Even if your neighbors have tested their homes, it's not a good idea to rely on their results. Everyone's home is different in local soil, construction techniques and maintenance. Also keep in mind that testing radon levels once doesn't mean you're protected from high radon level in the future. Radon levels may change over time due to things like remodeling or changes that are made to your home's heating, air-conditioning or ventilation systems.

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If you're building a new home, make sure to ask your builder about including radon-resistant construction features. Because radon is not regulated in many states, it's up to individual homeowners to reduce the risks to their families.

Getting More Information

Remember, what you don't know can hurt you-maybe even kill you. That is certainly true when it comes to Radon gas. To find out more about radon and how to get radon levels tested in your home, visit the EPA's radon information pages at http://www.epa.gov/radon/

A map of the US with Radon levels marked.

 

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May 1, 2005

Radon (Rn) is a colorless, odorless, radioactive gas. Radon is produced when trace amounts of uranium and radium in the soil or rocks decay.

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