Do face masks block radon gas or radon decay products?

As of July, 2022, the State of Colorado requires all radon measurement and mitigation professionals to be licensed by the State. Details can be found in the Radon Professionals Practice Act. If you are looing for a radon professional, be sure that the company you plan to hire is licensed by the State of Colorado. A list of licensed companies is found here. National Radon Proficiency Program (NRPP) and State of Colorado licensure information for Dr. Waldron and Mr. Kladder are provided here:

Hire Only Licensed Radon Professionals

Kim Waldron Credentials

NRPP-Certified Radon Measurement Professional with Standard and Analytical Services: ID #113537-RT

NRPP-Certified Radon Mitigation Specialist: ID #113604-RMS

NRPP-Certified Soil Gas Mitigation Compliance Inspector: ID #113611-SGM-CI

Colorado Department of Regulatory Agencies-Licensed Radon Measurement Professional: License #RME-0000448

Colorado Department of Regulatory Agencies-Licensed Radon Mitigation Professional: License #RMT-0000143

Doug Kladder credentials

NRPP-Certified Radon Measurement Professional with Standard and Analytical Services: ID #101271RT

NRPP-Certified Radon Mitigation Specialist: ID #1000005RMT

Colorado Department of Regulatory Agencies-Licensed Radon Measurement Professional: License #RME.0000299

Colorado Department of Regulatory Agencies-Licensed Radon Mitigation Professional: License #RMT.0000084