Radon causes approximately 21,000 lung cancer deaths every year in the United States, according to the Environmental Protection Agency. Yet, despite being classified as a carcinogen by the International Agency for Research on Cancer (IARC), public awareness remains surprisingly low.
Part of the problem is misinformation. From the belief that radon is only a concern in certain regions to the assumption that newer homes are automatically safe, uncertainty continues to put families at unnecessary risk.
Let’s separate the facts and myths about radon by examining the science behind the most common misconceptions.
What Is Radon?
Radon is a natural radioactive gas that is produced from uranium in soil and rocks. It moves up through the ground and can enter buildings through cracks and openings. Radon is invisible, odorless, and tasteless, so there is no way to tell if you have it without testing.
On average, one in 15 U.S. homes is estimated to have radon at or above the EPA’s recommended action level of 4 picocuries per liter (pCi/L). However, SWAT technicians often find radon much more prevalent, with rates as high as one-in-three homes in many areas we serve. Unfortunately, even at levels below 4 pCi/L, long-term exposure to elevated radon has been proven to be a cause of lung cancer.
With that in mind, let’s look at common myths about safe radon levels and radon in general.
Myth 1: Radon Isn’t Really Dangerous
This may be the biggest myth about radon, and it is important to understand why radon is dangerous and its potential impact on our health. The link between radon and lung cancer has been established over decades of research, supported by the National Cancer Institute, the World Health Organization, the American Lung Association and other major institutions worldwide.
Radon is the second-leading cause of lung cancer in the U.S., after cigarette smoking. For those who have never smoked, it’s the leading cause. The CDC estimates radon is responsible for more than 2,900 lung cancer deaths among nonsmokers every year.
So, this is not a vague possibility — it’s a well-documented cancer risk.
Myth 2: It Only Affects Certain Areas or Old, Damp Houses
Some areas do have higher radon potential because of the local geology. If the ground contains more uranium, buildings are more prone to higher radon levels. Governments often publish radon maps for that reason — however, that does not mean people in other regions are safe.
On top of that, radon is very local. Two houses on the same street, built at the same time, can have completely different radon readings because of small changes in foundations, cracks, drains and ventilation.
New homes are not automatically better, either. A very airtight, energy-efficient new build can sometimes trap radon more effectively than a slightly leaky older house.
Myth 3: If I Cannot Smell or See Anything, My Radon Level Must Be Fine
Another popular myth about radon is that it’s a visible issue in your home. However, you cannot see, smell or taste radon, and there are no early warning symptoms. The damage happens quietly over many years.
The particles can lodge in the lungs and release radiation that slowly harms lung cells. You only notice anything if cancer develops much later. So, using your senses will not help at all here — only a test kit or monitor will.
Myth 4: The Danger Only Starts at 4 pCi/L
Different countries set different radon levels at which they strongly recommend taking action. For example, the World Health Organization suggests a reference level of 100 Bq/m3, which is slightly under 3 pCi/L. If that cannot be reached for practical reasons, it recommends that levels should at least remain below 300 Bq/m3.
Lower levels are of course better, but there is no clear level at which the risk suddenly drops to zero. Unfortunately, there are also no immediate symptoms to suggest you’ve been exposed. The damage builds slowly, often over many years, which is why it’s easy to underestimate.
Myth 5: It Only Comes From Basements, and Higher Floors Are Safe
Radon mainly enters from the soil under and around the building. This is why basements and ground floors often have the highest readings. Once the gas enters, it moves with the indoor air. Heating, ventilation and normal airflow can distribute it throughout the building.
Common entry points include cracks in floors, gaps around pipes and joints in the foundation. From there, radon can drift throughout the home.
Myth 6: Short Tests Are Pointless
There are two main ways to measure radon in a home:
- Short-term test, (usually around three months or more)
- Long-term test, usually around three months or more
A long test offers a better picture of the true yearly average, because it smooths out changes between seasons and changes in how you use the building. That does not mean short tests are useless. They are a good first step when you want a quick check, you are doing a real estate transaction, or you want to know if more detailed testing is worth it.
If a short test result is clearly high, you can proceed to further testing and planning mitigation. If it is close to the action level, experts usually suggest repeating the test or following it with a long-term test before making big decisions.
Myth 7: Mitigation Rarely Works and Always Costs a Fortune
Radon control is invaluable in building risk management. It has been studied and applied in real homes for decades.
Common solutions include:
- Sub-slab depressurization systems that draw gas from under the foundation and vent it safely above the roof.
- Active sumps and under-floor ventilation.
- Sealing cracks and openings as a supporting step.
These methods can significantly reduce indoor radon levels, often bringing even very high starting levels below national target values.
Myth 8: I Can Just Open the Windows, and That Will Solve It
Opening windows can dilute radon, especially on a mild day with good cross ventilation. The problem is that this effect is temporary and unreliable.
As soon as windows close again — for example, in winter or at night — levels can climb back up. Changes in weather and air pressure can also quickly affect indoor radon levels, even with some ventilation.
Mechanical whole-house ventilation can form part of a solution. However, on its own, it often cannot consistently bring high radon levels down to the recommended range. Purpose-built systems that deal with the gas before or as it enters the home are much more dependable.
Protect Your Home With Professional Radon Mitigation
Don’t let myths put your family at risk. If you are unsure about your radon level or already know you need to fix the problem, we are here to guide you.
At SWAT Environmental, we can help install a mitigation system tailored to your property, using NRPP-certified technicians who follow EPA and AARST standards. Since 1988, we have installed hundreds of thousands of systems across the U.S. Our goal is to make your home or workplace safer with clear advice, respectful service and long-term support.
To get started, request a quick quote online.