Main Street Herculaneum

Main Street, Herculaneum

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

Pollutants Monitored: Sulfur Dioxide (SO2), Lead (Pb)

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
2004 (FIRST QUARTER Instrurment moved to: Main Street)
2004	0	.0101	.081	.411	.563
2005	0	.0103	.097	.317	.714
2006	0	.0106	.078	.232	.415
2007	0	.0101	.109	.373	.514
2008
FIRST QUARTER	0	.169	.131	.271	.435
SECOND QUARTER	not available
THIRD QUARTER	not available

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

Lead (Pb)

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

National Ambient Air Monitoring Standard: (24-hour samples; one taken every sixth day) A three-month average of 1.5 ug/m³ (micrograms per cubic meter).

Exceedances allowed without a violation being recorded: None.

The units for all averages in this chart are micrograms per cubic meter.
YEAR	NUMBER OF EXCEEDANCES	MAXIMUM 3-MONTH AVERAGE	MAXIMUM 24-HOUR AVERAGE
2004	0	1.475	11.336
2005	0	1.09	8.42
2006	1	1.925	13.712
2007	1	1.46	10.87
2008
FIRST QUARTER	1	2.01	8.99
SECOND QUARTER	not available	not available
THIRD QUARTER	not available	not available