Due to a number of calls regarding the use of air cleaning devices, we have been asked to post an interview with Dr. Philip Hopke that we conducted as a part of one our distance based courses.

Dr. Hopke's earlier research is often quoted as indicating that air filters could increase risk, due to a higher percentage of ultrafine radon decay products, formed in clean air. In this interview he discusses more recent work that, with more refined methodolgy, dispells the concept that air filters increase risk.

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