And a cool interactive map, too!
Radon is dangerous. I think just about everyone knows that. But how dangerous is it? That's where things start to get a little fuzzy. A friend and colleague recently endured a few months of radon poisoning with almost deadly results. This can happen to anyone that lives in a home with exposure risk. It's important to understand this deadly gas, why you should be aware of it, and how to mitigate the risk to you and your family.
The State of Oregon publishes an interactive map of indoor radon risk levels that was recently updated. This is a useful tool, but be aware that no matter the risk level in your area, you can still encounter a radon problem.
So what is radon?
You can't smell it, see it, or taste it. It's literally radioactive. It is the second-leading cause of lung cancer in the United States. But what in the world is this stuff and why does it want to kill us? Let's go into geek-speak for just a second.
Radon is a colorless, chemically-unreactive, inert gas discovered in 1899 partly by Ernest Rutherford and in 1900 partly by Friedrich Ernst Dorn. It is 9 times denser than air, which is an important factoid to remember. It easily penetrates almost any material in a building, including sheetrock, concrete block, wood paneling, and most insulations.
Radon is naturally occurring in the ground and is the result of the breakdown of uranium present in soil, rock, and water. It occurs in several isotopic forms, of which radon-222 occurs most frequently. When this gas is released into the environment, it results in the formation of decay products that are radioisotopes (a chemical element that has an unstable nucleus and emits radiation during its decay to a stable form) of heavy metals (polonium, lead, and bismuth). These decay products can easily be inhaled because they rapidly attach to other airborne materials (like dust). It also may be ingested if it is highly concentrated in groundwater (well water), but the inhalation of radon is of higher concern.
What are the symptoms of radon exposure?
Respiratory problems are the most common signs of radon-related distress. These problems can include: a persistent cough that doesn't get better, difficulty breathing, chest pains, the coughing up of blood, wheezing, hoarseness and recurring respiratory infections such as pneumonia or bronchitis. Radon exposure can lead to lung cancer.
A lesser known symptom of radon exposure is neurologic issues. Anxiety, memory loss, and depression could be a sign of radon exposure. However, brain health and function issues have many, many other possible causes, so this is not a symptom often mentioned.
Serious effects from high radon levels are cumulative over a long period of time. It's important to periodically test for radon, but the presence of high radon levels in your home or a home you are thinking about buying is not a reason to panic.
Where does radon occur?
Radon is found in every state in the country. If you take a look at the map and find that you are in an area that is considered low-risk, you still may encounter a radon problem. It often enters the home through cracks in floors, cracks in walls, gaps around service pipes, joints between floor and walls, gaps around drains/pipes, etc. You may have no problem at all with radon while your immediate neighbor is dealing with extremely high radon levels.
How do I test for radon?
Short term, long term, and continuous tests are available for radon. Tests should be conducted in the lowest livable area of your home (remember how radon is denser than air?). If you are considering selling your home, I highly recommend conducting a short term radon test before listing the home on the market. It doesn't cost much and is very much worth knowing the results before you're in the middle of a transaction!
Most people start with a short term test to determine whether or not further testing is necessary. The test takes between 2-7 days and are then mailed to a lab to determine the results. These are available at most home improvement stores and online.
Long term tests measure radon levels between 90 days and a year. They are more accurate than short term tests because radon levels can vary significantly from day to day and month to month. These tests are usually available through state agencies and online retailers.
Continuous radon testing devices plug into an outlet and can be used for both short and long term testing. They will give you a running average radon level. These are available from online retailers such as Amazon.
Home buyers: It's important to note that if you purchase a home in summer and conduct a radon test, you should conduct another test in winter when radon levels are more likely to be an issue.
Should I take action?
One out of every 15 homes in the U.S. have radon levels that should be lowered. Fortunately, reliable techniques exist to reduce radon levels in homes so that almost any home with high radon levels can be fixed. If you have a radon problem, you can hire an experienced radon contractor or accomplish the repairs yourself.
The EPA recommends doing a second test if an initial short-term test registers 4 picoCuries per liter (pCi/L) or higher. A long term test is ideal, but you can perform a second short term test if you need results quickly. If the second test results in levels higher than 4 pCi/L, consider taking action to mitigate radon levels in the home.
What can I do to mitigate radon in my home or reduce risk?
It does take more than just sealing cracks in the foundation to mitigate radon risk and/or exposure. Active soil depressurization or fan and exhaust systems have proven to be cost-effective and reliable.
Radon that escapes out into the air is not a problem as it quickly becomes diluted. Therefore, ventilation is key. Ventilation can be increased through opening doors, windows, and vents. Many people like to block their crawlspace vents in winter and/or install additional insulation in their crawlspace. Blocking crawlspace vents provides very minimal energy savings so unplugging these vents and possibly moving some insulation around may be all it takes to mitigate a mild to moderate radon problem. A heat recovery ventilator (air-to-air heat exchanger) can also be installed to increase ventilation.
All information above is provided for educational purposes. It is always recommended to consult a radon professional if you have any concerns about radon in your home.