...between indoor air pollution and heart disease.
A recent study published in the “American Journal of Respiratory and Critical Care Medicine” found that the quality of the air you breathe inside your home or office (recirculated indoor air) has an effect on your cardiovascular system - especially if you’re over 50. Although scientists have known for years that air pollution leads to an increased risk of cardiovascular disease (the number one killer in America), this was the first study to study the connection with indoor air. The results will not only surprise you, they’ll point out something you can do right now to help protect yourself and your family.
I could not find the article itself online, but the Balance-Your-Health Blog has a good summary. This blog also containds agvice on how to combat indoor air impurities. A few of which is to install a HEPA filter, or get quality air filters for your central air and change them often during times of high use.