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Tabline-AQAir Quality Resource Center

Ozone Eight-Hour Maximum Concentration by Monitor

Missouri and Illinois calculate eight-hour ozone averages based on monitored data and identify days which had a maximum eight-hour average of 70 ppb or greater (October 2015 eight-hour ozoe standard). 

OZONE MONITORS

1. Arnold West

2. Orchard Farm

3. West Alton

4. Maryland Heights

5. Pacific

6. Blair

7. Wood River (formerly 54 Walcott)

8. Maryville (formerly 200 W. Division)

9. Alton (formerly 409 Main St.)

10. East St. Louis (formerly 13th & Tudor)

Listed below are tables presenting the maximum eight-hour ozone value by monitor.   These tables present, on a weekly basis, the highest eight-hour average by monitor starting with 1999 and beginning in 2004 the four highest eight-hour ozone averages by monitor.  The 1997 eight-hour ozone standard (80 ppb) was used for period 19999-2007.  For 2008-2015, the 2008 eight-hour ozone standard (75 ppb) was used.  The measurement unit is parts per billion.

For 1999-2000 eight-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 1999 eight-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 1999-2003 eight-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 (1999-2004); Ladue (1999-2004); Clark in the City of St. Louis (1999-2004); and Edwardsville (1999-2004).  New monitor locations in 2005 are Maryland Heights, Pacific and Blair Street in the City of St. Louis.

As of April 2006, the monitor at the Queeny Park site has been deactivated.  Data is available for the period 1999-2005.

In 2008, monitoring equipment was moved from the Arnold site to the Arnold West site.

As of April 2009, the Sunset Hills monitor has been deactivated.  Data is available for 1999-2008.  The Margaretta monitor in the City of St. Louis has also been deactivated.  Information for this site is available for 2000-2008.

Weekly Tables Presenting Eight-Hour Ozone Averages by Monitor

8-Hour Ozone Averages by Monitor
(note: the files listed below are pdf files)
 

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East-West Gateway Council of Governments
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St. Louis, MO  63102
phone:  (314) 421-4220 or (618) 274-2750
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last update:  Monday, April 10, 2017