Radon in Shale Rocks in Pennsylvania

Pennsylvania, officially the Commonwealth of Pennsylvania, is a U.S. state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States. It borders Delaware to its southeast, Maryland to its south, West Virginia to its southwest, Ohio and the Ohio River to its west, Lake Erie and New York to its north, the Delaware …
Pennsylvania, officially the Commonwealth of Pennsylvania, is a U.S. state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States. It borders Delaware to its southeast, Maryland to its south, West Virginia to its southwest, Ohio and the Ohio River to its west, Lake Erie and New York to its north, the Delaware River and New Jersey to its east, and the Canadian province of Ontario to its northwest via Lake Erie.
  • Admitted to the Union: December 12, 1787 (2nd)
  • Capital: Harrisburg
  • Largest city: Philadelphia
  • Elevation: 1,100 ft (340 m)
  • Country: United States
  • Before statehood: Province of Pennsylvania
  • Largest county or equivalent: Philadelphia

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Data from: en.wikipedia.org