Canadian researchers have found that the use of high-efficiency portable air (HEPA) filters modestly improved the function of human endothelial cells and lowered C-reactive protein concentrations. Both these results potentially could improve heart health. The study was done in a small town heavily affected by wood-burning particulates. Authors suggest that their findings are very subtle, but might indicate serious effects over the long term.
PositiveTip: Breathing clean air is important, and avoiding tobacco smoke is the best way of cleaning up what you breathe.