Branch Street, St. Louis City
Site Operator: St. Louis City, Division of Air Pollution Control, Technical Services Section
Pollutants Monitored: 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; 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.
| YEAR | NUMBER OF EXCEEDANCES |
ANNUAL AVERAGE |
MAXIMUM 24-HOUR AVERAGE |
| 2006 Fourth Quarter |
0 | 31.7 | 93 |
| 2007 |
0 | 39.8 | 121 |
| 2008 | |||
| FIRST QUARTER | not available | not available | not available |
| SECOND QUARTER | not available | ||
| THIRD QUARTER | not available | ||
Updated: Only historical data shown below. Instrument has been discontinued.
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 |
| 2007(instrument INSTALLED late SECOND QUARTER 2007) | 35.4 | 35.4 | 15.54 |
| 2008 | |||
| THROUGH First QUARTER |
35.4 | 35.4 | 17.26 |
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