Study Examined Ozone Levels in 95 U.S. Cities
Changes in ground-level ozone were significantly associated with an increase in deaths in many U.S. cities, according to a nationwide study conducted by researchers at the Johns Hopkins Bloomberg School of Public Health and the Yale University School of Forestry and Environmental Studies. The risk of death was similar for adults of all ages and slightly higher for people with respiratory or cardiovascular problems. The increase in deaths occurred at ozone levels below the Environmental Protection Agency (EPA) clean air standards. The study appears in the November 17, 2004, edition of the Journal of the American Medical Association (JAMA.)
Ozone and Short-term Mortality in 95 US Urban Communities, 1987-2000
Michelle L. Bell, PhD; Aidan McDermott, PhD; Scott L. Zeger, PhD; Jonathan M. Samet, MD; Francesca Dominici, PhD
Context Ozone has been associated with various adverse health effects, including increased rates of hospital admissions and exacerbation of respiratory illnesses. Although numerous time-series studies have estimated associations between day-to-day variation in ozone levels and mortality counts, results have been inconclusive.