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EPA Issues New Standard Restricting Ozone Emission

The Environmental Protection Agency's new rule sets reduces the threshold for the particles that contribute to smog at 70 parts per billion, lower than than 75 ppb currently on the books. NPR's Ari Shapiro learns more from reporters Joe Wertz in Oklahoma and Mose Buchele in Texas. More Info: #FullNewsAudioAvailable #NPR


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