April-October 2017 – EWG prepared tables showing the daily maximum eight-hour ozone average, in parts per billion (ppb), by air quality monitor in the St. Louis (MO-IL) region; these tables are current through August 2017. Missouri and Illinois calculate the eight-hour average using one hour ozone concentrations. Exceedance of 2015 standard is 71 ppb or greater.
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2017
Environment