Orchard Farm

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.

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
1995	2	.137	not available	not available
1996	1	.147	not available	not available
1997	0	.108	not available	not available
1998	1	.136	not available	not available
1999	2	.143	not available	not available
2000	0	.118	not available	not available
2001	0	.105	not available	not available
2002	14	.145	.114	.098
2003	6	.119	.097	.090
2004	0	.093	.080	.076
2005	10	.120	.098	.092
2006	7	.111	.095	.092
2007	3	.111	.095	.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.