MedicineNet.com reports that researchers in Denmark found that using HEPA filters for just two days significantly improved cardiovascular health in healthy, nonsmoking elderly people.

"Our main finding was a significant improvement in the function of small finger blood vessels after reduction of indoor air particles. This effect most likely indicates a general improvement in the function of the inner lining of small vessels, including those supplying the heart," says Dr. Steffen Loft of the Institute of Public Health in Copenhagen. "This suggests that indoor air filtration represents a feasible means of reducing cardiovascular risk."

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