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Tabline-AQAir Quality Resource Center

OZONE ONE-HOUR MAXIMUM CONCENTRATION BY MONITOR

As part of the Ozone Data Tracking Project, the Environmental Services section of EWGCOG acts as a clearinghouse for April-October daily measured ozone data and helps to insure quality control on all monitored data.

OZONE MONITORS

1. Arnold West

2. Orchard Farm

3. West Alton

4. Maryland Heights

5. Pacific

6. Blair

7. Wood River

8. Maryville

9. Alton

10. East St. Louis

EWGCOG collects one-hour ozone data from the monitoring agencies for the previous day covering the period 9 a.m. to 9 p.m. CST.  All monitored data is initially screened for consistency and entered into an electronic spreadsheet program .  The following tables present on a weekly basis, the one-hour maximum concentration (or value) by monitor starting in 1998.  The measurement unit is parts per billion. 

For 1998-2000 one-hour ozone information is available for a monitor located on St. Charles Rock Rd. in St. Ann.  In 2001 this monitor was moved to the Breckenridge Hills site.

For 1998-1999 one-hour ozone information is available for a monitor located at Newstead and Cote Brilliante in the City of St. Louis.  In 2000 this monitor was moved to the Margaretta site.

For 1998-2003 one-hour ozone information is available for a monitor located on S. Broadway in the City of St. Louis.  In 2004 this monitor was shut down.

As of April 2005, monitors at the following sites have either been deactivated or relocated to another location: Breckenridge Hills (data available 2001-2004); Ferguson (1998-2004); Ladue (1998-2004); Clark in the City of St. Louis (1998-2004); and Edwardsville (1998-2004).  New monitor locations in 2005 are Maryland Heights, Pacific and Blair Street in the City of St. Louis.

For 1998-2005, one-hour ozone information is available for a monitor located in Queeny Park in St. Louis County.  As of April 2006, this monitor was deactivated.

For 1999-2007, information is available for the Arnold site.  In 2008, the equipment here was relocated to the Arnold West site.

For 1998-2008, data is available for the Sunset Hills monitor.  It was deactivated in 2009.  Information is available for the Margaretta monitor for 2000-2008.  This monitor was deactivated in 2009.

 

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The one-hour ozone standard was rescinded on June 15, 2005.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. 

Ozone 1-Hour Maximum Concentration by Monitor
(note: the files listed below are pdf files)
 

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East-West Gateway Council of Governments
One Memorial Dr., Ste 1600
St. Louis, MO  63102
phone:  (314) 421-4220 or (618) 274-2750
    fax: (314) 231-6120
e-mail: webmaster@ewgateway.org

 

last update:  Tuesday, February 07, 2017