In February 2, 2015, at the invitation of the Environmental Protection Agency (EPA) seeking comments on the optimal level of ozone for public health, Kent Pinkerton, PhD, Emeritus Scientist in the CNPRC Respiratory Diseases Unit and for the Inhalation Exposure Core, presented the scientific basis for requesting that national ozone standard be set at 60 ppb. He and co-researchers estimate that, at this level of ozone, between 5,210 and 7,990 premature deaths would be prevented annually. Dr.