As we all know, the EPA, then run by Lisa Jackson, was told in 2011 by the Obama White House to stand down for political reasons.
Before the political plug was pulled, here was EPA's proposal in January 2010:
….the Administrator concludes that a standard set as high as 0.075 would not be considered requisite to protect public health with an adequate margin of safety, and that consideration of lower levels is warranted.
…the Administrator proposes to set the level of the 8-hour primary O3 standard to within a range of 0.060 to 0.070 ppm…She solicits comment on this range.
We eagerly await the upcoming, court-ordered Dec. 1 deadline for a new proposal, to see how the current EPA handles not only the earlier medical evidence, but newer studies which show smog is even a bigger public health threat than previously acknowledged.
We hope politics isn't a factor again since this is, after all, a serious public health issue.