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Home > 2018 One-Hour Daily and Eight-Hour Weekly Ozone Averages with AQI Calendar

2018 One-Hour Daily and Eight-Hour Weekly Ozone Averages with AQI Calendar

Each month, from March through October, EWG prepares the daily (9 am – 9 pm) maximum one-hour and eight-hour ozone concentration, in parts per billion (ppb), for each of the air quality monitors located in the St. Louis (MO-IL) region and generates the Air Quality Index (AQI) calendar.  The tables use the 2015 ozone standard of 70 ppb. The AQI calendar depicts a color-coded graphic presentation of the maximum daily eight-hour ozone values for the same period.  Missouri and Illinois provide this information.

2018 One-Hour Ozone Averages by Monitor (March through October 2018)
2018 Eight-Hour Ozone Averages by Monitor (March through October 2018)
AQI Calendar (March through October 2018)
Download All 2018 Ozone Monitoring Documents

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Data 2018 Environment

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