Environmental Services Program

Herculaneum Thurwell Street Site

Site Operator: Missouri Department of Natural Resources Environmental Services Program

Pollutants Monitored: Lead (Pb)

Lead (Pb)

Updated: Only historic data is shown.  Instrument was shut down in 2005.

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.

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.

Lead (Pb)

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 (instrument installed third quarter)
2004 0 .36 .95
2005 (Instrument was shut down)
First Quarter 0 .224 1.462
Second Quarter 0 .142
Third Quarter Instrument removed not available

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