South Broadway and Hurck, St. Louis

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

Pollutants Monitored: Sulfur Dioxide (SO2), Inhalable Particulate (PM2.5)

Sulfur Dioxide (SO2)

Updated: Monthly.

National Ambient Air Monitoring Standard: A three-hour average of 0.50 ppm (parts per million) and/or a 24-hour average of 0.14 ppm (parts per million) and/or an annual average of 0.03 ppm (parts per million). Data reported in three decimal places must be rounded to two decimal places.

Exceedances allowed without a violation being recorded: One per year.

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 parts per million.
YEAR	NUMBER OF EXCEEDANCES	ANNUAL AVERAGE	MAXIMUM 24-HOUR AVERAGE	MAXIMUM 3-HOUR AVERAGE	MAXIMUM 1-HOUR AVERAGE
1993	0	.009	.029	.118	.154
1994	0	.009	.039	.082	.141
1995	0	.007	.039	.106	.161
1996	0	.006	.026	.122	.247
1997	0	.009	.045	.138	.161
1998	0	.006	.032	.138	.276
1999	0	.006	.020	.073	.095
2000	0	.004	.022	.058	.080
2001	0	.004	.017	.065	.090
2002	0	.0043	.022	.041	.064
2003	0	.0034	.024	.055	.090
2004	0	.0039	.018	.045	.079
2005	0	.0040	.025	.046	.090
2006	0	.0029	.015	.072	.114
2007	0	.0026	.013	.043	.058
2008
FIRST QUARTER	not available	not available	not available	not available	not available
SECOND QUARTER	not available
THIRD QUARTER	not available

Graph of Recent Sulfur Dioxide (SO2) Data
Graph of SO2 PPM.

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

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	not available	not available	not available
2000	42.3	39.2	15.78
2001`	52.5	40	14.8
2002	67.2	46	15.3
2003	48.7	40.8	14.4
2004	39.5	35.0	13.09
2005	48.3	46.9	15.86
2006	35.4	33.8	13.12
2007	45.0	41.3	14.04
2008
THROUGH FIRST QUARTER	not available	not available	not available