Interesting, I didn’t know.

> The U.S. Environmental Protection Agency says most granite countertops are safe, adding little to a house's radon level. It depends on the rock that is used, the agency says, recommending that homeowners concerned about radon get their countertops tested."

https://www.naturalstoneinstitute.org/designprofessionals/ra...

>Radon

I live in a high-radon part of the world (Appalachia), and there are so many more benefits to having an ERV[0] than just getting rid of toxic gasses (handles farts, too!). Worth every penny — one will remove stink from the entire 1000sqft house (including indoor cat litterbox), with partial heat/humidity recovery.

[0] Energy recovery vent, e.g. https://www.homedepot.com/p/Panasonic-WhisperComfort-60-20-5...