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One component for measuring the effectiveness of local air pollution control programs is the ongoing collection of ozone data generated by a network of 13 air pollutant monitors
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OZONE MONITORS AS OF APRIL 2006
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Missouri Monitors
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1. Arnold
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Jefferson County
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2. Orchard Farm
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St. Charles County
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3. West Alton
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St. Charles County
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4.Maryland Heights
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St. Louis County
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5. Pacific
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St. Louis County
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6. Sunset Hills
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St. Louis County
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7. Blair
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City of St. Louis
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8. Margaretta
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City of St. Louis
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Illinois Monitors
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9. Wood River
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Madison County
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10. Maryville
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Madison County
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11. Alton
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Madison County
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12. East St. Louis
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St. Clair County
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13. Jerseyville
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Jersey County
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located throughout the St. Louis area. These monitors are operated and maintained by the Missouri Department of Natural Resources, the Illinois Environmental Protection Agency, the St. Louis
County Air Pollution Control Program and the City of St. Louis Air Pollution Control Program. Click here for a map of the monitors located in the St.
Louis region.
During the ozone season (April-October), the Environmental Services section of EWGCOG acts as a clearinghouse for daily measured ozone data and helps to insure quality control on
all monitored data. EWGCOG collects ozone data from the monitoring agencies for the previous day covering the period 9 a.m. to 9 p.m. CST. The data is examined for problems,
missing values and exceedances of the eight-hour ozone standard (0.85 ppm or greater) and maximum eight-hour averages by monitor. This
information is entered into a computer spreadsheet program for which the measurement unit is parts per billion (ppb). The data assembled by EWGCOG is screened by staff to insure no
missing or skewed data enter the reporting system. Weekly reports are prepared by staff and forwarded to the monitoring agencies and USEPA.
2002-2006 Exceedances of Eight-Hour Ozone Standard
Four Highest Maximum Eight-Hour Ozone Averages by Monitor by Year:
2004
2005
2006
EXCEEDANCES OF THE ONE-HOUR OZONE STANDARD
The one-hour ozone standard was rescinded on June 15, 2005. The one-hour ozone standard was exceeded whenever the hourly average value of any monitor is recorded as 0.125 ppm or
greater on any day. The one-hour ozone standard is considered to be violated when any monitor has more than three exceedances of the standard over a three year period. It was not unusual
for there to be more than one monitor with recorded exceedances on the same day.
Exceedences of the One-Hour Ozone Standard - 2002-2004
Ozone One-Hour Maximum Concentration by Monitor
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