Does granite contain harmful radon gases?

The Marble Institute of America’s study, conducted by the University of Akron, analyzed 52 samples of granite used most frequently in homes and found that the vast majority added “almost immeasurable amounts of radon to the house” The highest level emitted by any stone studied in that research as 0.27 Pico curies per liter (pCi/L), far below the 4 pCi/L that the Environmental Protection Agency says warrants corrective action. In actuality, radon gas emissions are more harmful from surfaces such as concrete, cement and gypsum which surround us on a daily basis. It is an unstable gas that quickly breaks down and dissipates in the air.