Is Indoor Air Quality good for cardiovascular health?

The evidence points that way, though it's not yet conclusive. Improving indoor air quality with portable HEPA filtration has a real but genuinely inconsistent randomized-trial evidence base, with cardiovascular benefits appearing in some trials and not others. That's reflected in an evidence score of 45/100 for its role in cardiovascular health, drawn from 5 studies (5 RCTs), with an estimated impact on longevity rated limited (28/100).