EPA proposes tightening primary ozone standards to range of 65-70 ppb; final rule by October 2015
Green Car Congress
NOVEMBER 26, 2014
'Counties where measured ozone is above proposed range of standards, based on 2011-2013 monitoring data. Source: EPA. Click to enlarge. The US Environmental Protection Agency (EPA) is proposing tightening the ground-level 8-hour ozone (O 3 ) National Ambient Air Quality Standards (NAAQS) to within a range of 65 to 70 parts per billion (ppb), while taking comments on a level as low as 60 ppb.
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