Can high-efficency (or HEPA) air filters help reduce indoor radon levels?

Answer: Never
Explanation: Air filters do not remove radon. Radon is a radioactive gas. Filters remove particles from the air, not radon.

Answer: In some cases
Explanation: DFS technology, with 9 stages of filtration. Originally developed for the U.S. Military, DFS technology is the gold standard when it comes to protecting families from airborne allergens, gases and volatile organic compounds. Ultrafine particles are another indoor air hazard which can reduce blood flow and lead to cardiovascular disease. DFS captures 99.99% of ultrafine particles at .007 microns - 40 times more efficient than HEPA.

Answer: Never
Explanation: No. This is a particulate filter and Radon is a gas.

Answer: Never
Explanation: HEPA filters take in Particulates and trap them in the filter then release clean air. What I mean by Particulates is dust, mold spores, etc. Radon is a gas and cannot be trapped by a filter.

Answer: Never
Explanation: Radon cannot be filtered out of a home. Radon naturally dissipates with time and is constantly replenished by more radon entering the home.