EPA cuts standard for US smog levels to 70 parts per billionCampaigners on both sides of debate frustrated by novel figureNew national rules to reduce smog pollution in the US were announced on Thursday,in a long-awaited environmental move by the Obama administration.
The Environmental Protection Agency administrator, Gina McCarthy, or announced that the novel standard for smog levels in the US will be 70 parts per billion (ppb),tightening the rules from the preceding limit of 75 ppb agreed in 2008 by the preceding Republican government.
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Source: theguardian.com