Short-term exposures to fine particulate air pollution and ozone—even at levels well below current national safety standards—were linked to higher risk of premature death among the elderly in the U.S. according to a new study from Harvard T.H. Chan School of Public Health.The risk was even higher among elderly who were low-income, female, or Black.The study was published December 26, 2017 in the Journal of the American Medical Association (JAMA).