Radon on Long Island


Radon is a carcinogenic gas that is hazardous to inhale . It is the byproduct of the natural (radioactive) breakdown of uranium in soil.   Since Long Island is the residue of a sandy glacier, Long Island just does not have much uranium in the ground to make hazardous levels of radon.

The United States Environmental Protection Agency (EPA) states that concentrations of radon on Long Island are extremely low.

Radon numbers and facts for Long Island: 

  • Nassau County registered the lowest level in New York State with an average of 1.6 pCi/L (picocuries per liter) of air. 

  • Suffolk County registered the second lowest level in New York State with an average of 2.0 picocuries per liter of air .

The EPA considers a reading below 4.0 to be safe.