 The study found that particulate matter containing nickel, arsenic, chromium, bromine, and oxygenated compounds had a stronger association with hospital admissions for cardiovascular diseases, myocardial infarctions, congestive heart failures, respiratory diseases, and diabetes compared to other types of particulate matter. These results suggest that particulate matter from industrial combustion sources and traffic may be more toxic than other types of particulate matter. This article was authored by Kutraki's Petros, Franklin Meredith, Sanabeti Antonella, and others.