Chronic exposure to ground level ozone, a powerful greenhouse gas and a widespread air pollutant in many major cities, is linked to premature death from cardiovascular disease, finds a new study led by University of California, Berkeley School of Public Health researchers. The analysis, funded by the California Air Resources Board and published in the American Journal of Respiratory and Critical Care Medicine, also found a strong link between nitrogen dioxide, a marker for traffic pollution, and increased risk of death from lung cancer.