A study concludes that the use of portable home air purifiers can improve markers of cardiovascular health in people with chronic obstructive pulmonary disease, or COPD. People suffering from COPD often experience shortness of breath, chest tightness and chronic cough. Cardiovascular diseases commonly accompany COPD. The new research is a secondary study of the CLEAN AIR study. The CLEAN AIR study found that people with COPD experienced improved symptoms after using portable air purifiers indoors. First, researchers had trained technicians take air samples of indoor particulate matter of varying sizes. These indoor air pollutants are composed of such things as...