Environment News Service: Scientific evidence is mounting that connects an increase in particulate air pollution with an increase in heart attacks and deaths. Research from the relatively new field of environmental cardiology includes a 16-year-long Harvard University study of six U.S. cities that found fine particulate pollution, even at levels below the federal health standard, can shorten lifespans by two years. A majority of these earlier deaths were due to heart disease. A study in Salt Lake City …