If your apartment is at or above the third floor and you are concerned about this possibility, you could also decide to test for radon. You can test for radon yourself. You can also hire a professional to test your home for radon. Testing for radon is easy to do, and takes very little time. To test for radon yourself, you must first get a radon test device.
Some laboratories provide kits through mail order.
Make sure you get one that meets EPA's requirements or your state's requirements - the test kit will usually say so on the package. The price generally includes the cost of having a laboratory analyze the test. The quickest way to test for radon is with a short-term test. Short-term tests remain in your home for 2 days to 90 days, depending on the device. Long-term tests remain in your home for more than 90 days.