Feldman said, "EPA has not proven a 'cause and effect' between PM 2.5 below the current standards and health effects . Taken as a whole, the scientific studies cut in different directions . There is no need to move the goalposts now. I am encouraged by the progress our nation has made in reducing fine particle emissions in our skies. The concentration of PM2.5 in the nation's air has declined by 24 percent between 2001 and 2010. The U.S. oil and natural gas industry has significantly contributed to these improvements by developing and manufacturing ultra-clean fuels that can be used in the new very low emission diesel and gasoline engines. More good news is that the improvements will continue . When announcing this proposal, EPA stated that it has issued a number of rules already that will continue to make significant strides toward reducing fine particle emissions in the years ahead. These future improvements are independent of whether any action is taken to change these standards."
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