Environmental Services Program

Arnold West

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

County: Jefferson        Site ID: 29-099-0019

Pollutants Monitored: Ozone (O3), Inhalable Particulate (PM2.5)


Ozone (O3)

Updated: Quarterly.

National Ambient Air Monitoring Standard:

Eight-hour Standard
The three-year average of the fourth highest daily maximum eight-hour average must not be greater than 0.075 ppm (parts per million). To attain this standard, the three-year average of the fourth-highest daily maximum eight-hour average ozone concentrations measured at each monitor within an area over each year must not exceed 0.075 ppm.  (Effective May 27, 2008).

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.

 

Ozone (O3)

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
1993 0 0.120 not available not available
1994 2 0.138 not available not available
1995 2 0.126 not available not available
1996 1 0.133 not available not available
1997 1 0.138 not available not available
1998 1 0.129 not available not available
1999 1 0.136 not available not available
2000 0 0.104 not available not available
2001 0 0.107 not available not available
2002 13 0.119 0.014 0.093
2003 3 0.134 0.107 0.082
2004 0 0.093 0.080 0.070
2005 4 0.112 0.100 0.092
2006 2 0.109 0.089 0.079
2007 4 0.106 0.093 0.087
2008   (site moved to Arnold West)
2008 2 0.089 0.080 0.070
2009 1 0.083 0.077 0.070
2010 7 0.103 0.086 0.077
2011 3 0.119 0.102 0.075
2012 16 0.110 0.101 0.085
Year Number of Days
Over Standard
Maximum
1-Hour Average
Maximum
8-Hour Average
Fourth Maximum
8-Hour Average
2013
First Quarter   0.078 0.071 0.065
Second Quarter 0
Third Quarter  

 


Inhalable Particulate (PM2.5)

Updated: Quarterly.

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.

Inhalable Particulate (PM2.5)

The units for all averages in this chart are micrograms per cubic meter.
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)
2008 32.7 28.4 11.41
2009 29.6 27.2 10.72
Year First Maximum
24-Hour Average
98th Percentile Value Annual
Average
2010 37.2 24.1 10.52
2011 28.5 23.6 9.94
Data from 2012 on is collected from a continiously operated TEOM DF.
2012 30.5 21.4 9.75
2013
Through
Second Quarter
29.0 27.3 9.22

Arnold West air monitoring site