Arnold
Site Operator: Missouri Department of Natural Resources' Environmental Services Program
Pollutants Monitored: Ozone (O3), Inhalable Particulate (PM2.5)
Updated: Monthly April through October.
National Ambient Air Monitoring Standard:
8-hour Standard
The three-year average of the fourth highest daily maximum eight-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 eight-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.
| YEAR | NUMBER OF DAYS OVER STANDARD | MAXIMUM 1-HOUR AVERAGE |
MAXIMUM 8-HOUR AVERAGE |
Fourth MAXIMUM 8-HOUR AVERAGE |
| 1993 | 0 | .120 | not available | not available |
| 1994 | 2 | .138 | not available | not available |
| 1995 | 2 | .126 | not available | not available |
| 1996 | 1 | .133 | not available | not available |
| 1997 | 1 | .138 | not available | not available |
| 1998 | 1 | .129 | not available | not available |
| 1999 | 1 | .136 | not available | not available |
| 2000 | 0 | .104 | not available | not available |
| 2001 | 0 | .107 | not available | not available |
| 2002 | 13 | .119 | .014 | .093 |
| 2003 | 3 | .134 | .107 | .082 |
| 2004 | 0 | .093 | .080 | .070 |
| 2005 | 4 | .112 | .100 | .092 |
| 2006 | 2 | .109 | .089 | .079 |
| 2007 | 4 | .106 | .093 | .087 |
| 2008(site moved to Arnold West) | ||||
| FIRST QUARTER | not available | not available | not available | not available |
| SECOND QUARTER | not available | |||
| THIRD QUARTER | not available | |||
Graph of Recent Ozone (O3) Data
Updated: Within 90 days after the end of a quarter.
National Ambient Air Monitoring Standard: (24-hour samples; one taken every third day) A three-year average of the 98th percentile 24-hour averages equal or greater than 35 ug/m3 (micrograms per cubic meter) and/or a three-year average of annual averages equal or greater than 15.0 ug/m3 (micrograms per cubic meter).
Exceedances allowed without a violation being recorded: Two percent of daily observations
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.
| YEAR | FIRST MAXIMUM 24-HOUR AVERAGE |
SECOND MAXIMUM 24-HOUR AVERAGE |
ANNUAL AVERAGE |
| 1999 | 46.5 | 45.4 | 15.16 |
| 2000 | 34.8 | 27.6 | 14.71 |
| 2001 | 34.8 | 27.6 | 14.71 |
| 2002 | 69.9 | 49.0 | 16.0 |
| 2003 | 44.3 | 39.9 | 13.9 |
| 2004 | 41.0 | 35.9 | 13.57 |
| 2005 | 46.3 | 45.8 | 15.40 |
| 2006 | 39.1 | 34.1 | 12.59 |
| 2007 | 45.7 | 42.5 | 13.68 |
| 2008(site moved to Arnold West) | |||
| THROUGH FIRST QUARTER |
32.7 | 21.9 | 12.15 |
Graph of Recient (PM2.5) Real Time Data
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Current Data |
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