Mound and Second

Site Operator: St. Louis City, Division of Air Pollution Control, Technical Services Section

Pollutants Monitored: Inhalable Particulate (PM2.5)(inactive), Inhalable Particulate (PM10)


Inhalable Particulate (PM2.5)

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.

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 29.0 28.9 15.81
2000 43.3 42.3 15.66
2001 51.3 42.1 15.66
2002 54.7 43.0 15.60
2003 50.2 41.2 14.7
2004 47.3 42.3 13.57
2005 46.7 45.3 15.88
2006 35.8 35.0 13.65
2007 47.9 47.9 14.34
2008
THROUGH
First QUARTER
32.5 22.9 13.04


Inhalable Particulate (PM10)

Updated: Within 90 days after the end of a quarter.

National Ambient Air Monitoring Standard: (24-hour samples; 1 taken every 6th day) A 24-hour average of 150 ug/m3 (micrograms per cubic meter) and/or an annual average of 50 ug/m 3 (micrograms per cubic meter).

Exceedances allowed without a violation being recorded: None.

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 micrograms per cubic meter.
YEAR NUMBER
OF
EXCEEDANCES
ANNUAL
AVERAGE
MAXIMUM
24-HOUR
AVERAGE
2001 0 34 74
2002 0 32 78
2003 0 31 62
2004 0 26.6 58
2005 0 32.9 65
2006 0 25.9 71
2007 0 25.9 71
2008
FIRST QUARTER 0 17.8 36
SECOND QUARTER 0
THIRD QUARTER 0

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