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)

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
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

Inhalable Particulate (PM2.5)

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

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
2007(instrument INSTALLED late SECOND QUARTER 2007)	35.4	35.4	15.54
2008
THROUGH First QUARTER	35.4	35.4	17.26