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The EPA under Obama proposed in January 2010 a range for the concentration of ground-level ozone allowed in the air — from 60 parts per billion to 70 parts per billion. That’s about equal to a single tennis ball in an Olympic-size swimming pool full of tennis balls.
Jackson, Obama’s environmental chief, said at the time that "using the best science to strengthen these standards is a long overdue action that will help millions of Americans breathe easier and live healthier."
The American Lung Association, which sued the EPA over the Bush standard, said it would continue its legal fight now that Obama is essentially endorsing the weaker limit. The group had suspended its lawsuit after the Obama administration vowed to correct it.
Associated Press writer Jim Kuhnhenn contributed to this report.
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