The Environmental Protection Agency has taken necessary steps to control air pollution and improve public health, largely on the basis of decades of study, said C. Arden Pope III, an economist who has contributed to key studies on particulates and air pollution. "The bigger the decline in air pollution, the greater the increase in life expectancy," he said. "There is no question that the efforts we've made, including the efforts of the EPA, have contributed to the success we've had in reducing air pollution."

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