EPA believes the principal source of radiation in homes is not granite countertops, but naturally-occurring radon that seeps into buildings from the ground. While natural rocks such as granite may emit radiation and radon gas, the levels attributable to such sources are not typically high. If you are concerned about radon levels in your home, you should first test the air in your home to determine the radon level. For more information, see Find a Radon Test Kit or Measurement and Mitigation Professional.

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