On Oct. 1, 2015, the U.S. Environmental Protection Agency (EPA) announced it established a new uniform standard for both primary and secondary ozone, set at 70 parts per billion (ppb) each. The standard was lowered from the one set in 2008 by 5 ppb. This national ozone standard is averaged over a period of eight hours.
On Feb. 3, 2016, meanwhile, in “Group challenges newest ozone standard: What this is about,” I wrote: “As it happened, after eight years with National Ambient Air Quality Standards (NAAQS) for ozone averaged over eight hours set at 75 parts per billion (ppb) in 2008,
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