I've recently heard of this threat to our health and I'm trying to educate myself on how to best protect myself and my family from it. I've been living for the past few years in a rented apartment in an old 16 story building (50-60 years old) and I'm not planing on moving anytime soon, so I'd like to find out how pressing it is for me to spend money on radon testing. Any information on this matter is welcome, thank you for your time!
Threats to health can be scary. But in this case, you'll want to keep on learning about radon. Learn what it is, exactly; learn where it's found in terms of what part of the building, and how it's mitigated.
The upshot is I've never heard of a radon mitigation system on the second floor, least of all the 9th! You have more to fear from wildfire.
Radon is emitted only from rocks in the ground or from masonry. Unless your apartment is composed entirely of raw concrete and has no ventilation, radon is an unlikely concern. You can buy small testing kits that will tell you how much radon is present.
On another note, it also debatable what concentration of radon is linked to an increase in cancer. Small doses appear to have a beneficial affect, as they stimulate the body's defenses to damaged cells. See https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3315166/
Do not cast this off as unlikely.
Radon is a gas that infiltrates buildings and can cause breathing problems. We dispose of radon by installing tubes in the ground and extend the tubes up through the roof.
Often, because there isn’t enough ground pressure to move the radon up and away, we install exhaust fans and exhaust the tubes up through the roof.
While I’ve never extended tubes up 9 stories, I’ve extended them 3 stories.
I’d check with building maintenance to verify that if there is an exhaust system, that it’s been certified to be solid and in tact (no cracks that could leak into your unit, other’s unit, corridors, etc.)
There are maps that show likely radon hot-spots. I’d Google “radon map USA”.