Environmental Services Program

Main Street, Herculaneum

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

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


Sulfur Dioxide (SO2)

Updated: All data is historical, this site was moved to Herculaneum, Mott street.

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.

Sulfur Dioxide (SO2)

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 Instrument moved to: Main Street)
2004 0 0.0101 0.081 0.411 0.563
2005 0 0.0103 0.097 0.317 0.714
2006 0 0.0106 0.078 0.232 0.415
2007 0 0.0101 0.109 0.373 0.514
2008 0 0.0113 0.131 0.338 0.696
2009 0 0.0107 0.089 0.319 0.557
The units for all averages below this line are reported in parts per billion.
Year Number of
Exceedances
Annual
Average
Maximum
1-Hour Average
Maximum
24-Hour Average
99th Percentile 1-Hour Average
2010 0 10.35 292.0 64.6 199.0
2011
First Quarter 0 9.40 227.5 43.7 171.6
Second Quarter 0
Third Quarter 0


Lead (Pb)

Updated: All data is historical, this site was moved to Herculaneum, Mott street.

National Ambient Air Monitoring Standard:

Primary: 0.15 µg/m3
Secondary: Same as the primary standard

On Nov. 12, 2008, EPA substantially strengthened the National Ambient Air Quality Standards for lead (see 73 FR 66964).  EPA lowered the level of the primary (health-based) standard from 1.5 micrograms per cubic meter (µg/m3) to 0.15 µg/m3, measured as total suspended particles.  EPA also revised the secondary (welfare-based) standard to be identical to the primary standard. 

The standard is based on the highest rolling three-month average over a period of three years and two months. The standard is met at a monitoring site when the three-month average is less than or equal to 0.15 μg/m3. For specific rules and technical information, consult 40 CFR Pt. 50, Appendix R.

The units for all averages in this table are micrograms per cubic meter. Data in this table, is calculated at local conditions using daily average temperature and barometric pressure. Lead is sampled on a set schedule.  Results in this table are a combination of samples for this site taken on an every third day run schedule.

Disclaimer: The following data is calculated using the lead National Ambient Air Quality Standards regulations. data shown below has been subject to data review and validation procedures by the department. The units for all averages in this table are micrograms per cubic meter. Data in this table, is calculated at local conditions using daily average temperature and barometric pressure. Lead is sampled on a set schedule.  Results in this table are a combination of samples for this site taken on an every day run schedule for the primary, every other day for the collocated sampler.

Lead (Pb)

The units for all averages in this chart are micrograms per cubic meter.
Herculaneum Main Street Primary Sampler
Year Month Monthly
Average
3-Month
Rolling Average
Month Monthly
Average
3-Month
Rolling Average
2011 January 0.71395 1.03 Site moved to Mott Street in July 2011. Please see Mott Street for more current data. Herculaneum, Mott Street
February 0.847038 0.92
March 0.864277 0.81
April 0.9411666 0.88
May 1.1073 0.97
2010 January 0.5023448 1.05 July 0.9073032 0.96
February 0.5339143 0.87 August 1.45078214 0.92
March 0.9281710 0.65 September 0.6973103 1.02
April 0.8600733 0.77 October 0.3163935 0.82
May 1.5762677 1.12 November 1.17696 0.73
June 0.408103 0.95 December 1.188 0.89
2009 January 0.31 0.640 July 0.856 0.775
February 1.522 0.758 August 0.993 0.789
March 0.883 0.940 September 0.256 0.701
April 1.074 1.160 October 0.757 0.668
May 0.951 0.969 November 1.090 0.701
June 0.518 0.848 December 1.560 1.136

 

The units for all averages in this chart are micrograms per cubic meter.
Herculaneum Main Street #1 Collocated Sampler
Year Month Monthly
Average
3-Month
Rolling Average
Month Monthly
Average
3-Month
Rolling Average
2011 January 0.89944 1.21 Site moved to Mott Street in July 2011. Please see Mott Street for more current data.  Herculaneum, Mott Street
February 0.5583 0.96
March 0.68316 0.71
April 1.14876 0.8
May 0.667757 0.83
 
2010 January 0.6598 1.19 July 0.85476 1.26
February 0.5460714 0.9 August 1.6266714 0.98
March 1.0810625 0.76 September 1.06816 1.18
April 0.76142 0.8 October 0.37149 1.02
May 2.4939714 1.45 November 1.29659 0.91
June 0.446146 1.23 December 1.42667 1.03
2009 January 0.20 0.55 July 0.943 0.749
February 1.176 0.625 August 0.661 0.699
March 1.031 0.802 September 0.173 0.592
April 1.336 1.181 October 0.862 0.565
May 0.811 1.059 November 1.396 0.810
June 0.492 0.879 December 1.508 1.255

Photograph of Herc main site

Updated: Data shown is historical and will not be updated.  More present data is updated in the tables above.

National Ambient Air Monitoring Standard:

Quarterly Average

The quarterly average must not exceed 1.5 µg/m3.

For more information visit EPA's Lead in Air webpage.

Exceedances allowed without a violation being recorded: None

Disclaimer: The following table is a summary of Lead data (through 2008) calculated using the previous Lead National Ambient Air Quality Standards regulations, which compares a quarterly average to1.5 μg/m3.  Data was calculated using EPA standard conditions of ambient temperature and barometric pressure.  All data in this table is historical and will not be updated.

The units for all averages in this chart are micrograms per cubic meter.
Herculaneum Main Street Primary
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 1 2.0048 8.9870
Pb standard and sampling requirements changed Data from 2009 on is presented in the table above

 

The units for all averages in this chart are micrograms per cubic meter.
Herculaneum Main Street Collocated
Year Number of
Exceedances
Maximum
3-Month Average
Maximum
24-Hour Average
Sampling began third quarter 2008
2008 1 0.8072 3.1290
Pb standard and sampling requirements changed Data from 2009 on is presented in the table above

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