Can a high efficiency or HEPA filter reduce radon levels?

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Radon is a noble gas which means it does not stick to anything including furnace filters, so filters will not reduce radon levels. Filters will capture radon decay products which are charged particles. There is some discussion among experts that this may reduce the health risk but the furnace fan would need to run continuously and filter every occupied room. The EPA does not recommend radon remediation using filters. more
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