In recent decades the EPA has severely tightened the nation’s air quality standards. But is such a tightening still warranted from a public health perspective? Well not according to Dr. John Dunn of the Heartland Institute who has this to say: “The Environmental Protection Agency has just written another set of tighter air quality standards for American cities which relies on claims that air pollution kills people in an interval of a few days. That’s nonsense. The studies show small mortality number changes and do not meet the scientific requirement of at least 100 percent likelihood. The EPA health effects studies are nothing but an uncertainty wrapped in a deception. The EPA needs to take a deep breath of good American air and stop claiming a crisis.”