Did you know, There is some sort of radon in every building.
https://www.epa.gov/sites/production/files/2014-08/documents/pennsylvania.pdf https://www.epa.gov/sites/production/files/2015-03/documents/new_jersey.pdf
https://www.epa.gov/sites/production/files/2014-08/documents/pennsylvania.pdf https://www.epa.gov/sites/production/files/2015-03/documents/new_jersey.pdf