The Trump administration plans to retain a national limit of 70 parts per billion for the pollutant ozone, the standard set by the Obama administration five years ago after business groups fought tougher standards.
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Sun, 07/12/2020 - 7:02pm
The Trump administration plans to retain a national limit of 70 parts per billion for the pollutant ozone, the standard set by the Obama administration five years ago after business groups fought tougher standards.