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Site Operator: Missouri Department of Natural Resources' Environmental Services Program.

Pollutants Monitored: Ozone (O3)

Ozone (O3)

Updated: Monthly April through October.

National Ambient Air Monitoring Standard:

8-hour Standard
The three-year average of the fourth highest daily maximum 8-hour average must not be greater than .08 ppm (parts per million). Data reported in three decimal places must be rounded to two decimal places.

1-hour Standard 1970 to 1997-no longer applies to any area in Missouri.
A one-hour average of 0.12 ppm (parts per million).

Exceedances allowed without a violation being recorded:
The term exceedance does not apply to the 8-hour standard. The three-year average is used to determine designation of attainment or non-attainment.

DISCLAIMER: Yearly and quarterly data shown below has been subject to data review and validation procedures by the reporting agency. Monthly data and data shown graphically is raw, unreviewed and unvalidated data.

The units for all averages in this chart are parts per million.
YEAR	NUMBER OF DAYS OVER STANDARD	MAXIMUM 1-HOUR AVERAGE	MAXIMUM 8-HOUR AVERAGE	Fourth MAXIMUM 8-HOUR AVERAGE
2004	0	.097	.079	.071
2005	4	.109	.093	.087
2006	4	.100	.089	.085
2007	3	.104	.090	.083
2008
FIRST QUARTER	not available	not available	not available	not available
SECOND QUARTER	not available
THIRD QUARTER	not available

Graph of Recent Ozone (O3) Data
Graph of O3 PPM.