Address: 747 Mott St.
               Herculaneum, MO 63048
County: Jefferson
Month site established: June 1, 2011
Pollutants monitored: Sulfur dioxide (SO2) and lead (Pb)
Site coordinates
   * Latitude: 38.263394°
   * Longitude: -90.37967
EPA ID No.: 29-099-0027

Until June 2011, the department operated a monitoring station on Herculaneum's Main Street
in the town's city hall. When the city asked the department to move
the monitor because of construction,
the state worked with Doe Ron to move the station to a monitoring site that the company used to operate on Mott Street.

The 2011 Monitoring Network Plan explains the situation.

Sulfur Dioxide (SO2) Data*

In 2010, EPA set a new one-hour sulfur dioxide standard
and introduced a new form for determining design value
and compliance. The new form requires three years of data consisting
of the average SO2 concentrations from each hour. To calculate the design value
and determine compliance, the department and EPA use the 99th percentile
of daily maximum one-hour average concentrations, averaged over three years.

Weekly summary of preliminary data from all SO2 sites

Up-to-date preliminary data from Herculaneum — Mott
   • SO2 data in third column
   • Data from last 10 days through current date

Up-to-date preliminary data from all state SO2 sites
   • Data from last 10 days through current date

Graph of design values from all SO2 sites, beginning in 2003

* Technical issues can affect ability to deliver quality data.
Access a table of symbols indicating problems.

Lead (Pb) Data*

In 2008, the EPA tightened the standard for airborne lead to 0.15 micrograms per cubic meter,
calculated as three-month rolling averages. EPA also required states to install and
operate source-oriented monitors, particularly near sources that annually emit more than one ton
of lead emissions. Missouri operates 13 sites that monitor lead.

All preliminary three-month average concentrations for the most recent 12 months  

Graph of design values for all of state sites in the Herculaneum area, beginning in 2003

* Technical issues can affect ability to deliver quality data.
Access a table of symbols indicating problems.

Related Links

Missouri's mapped network of air monitoring sites

National standards for pollutants

The 2011 Air Monitoring Network Plan discusses the establishment of the site.

Real-time view from cameras in Kansas City, St. Louis

Daily Air Quality Forecast (AirNow) shows how current readings rate on the EPA's Air Quality Index (AQI).
Click on Missouri in the state box at the top of the home page to access information.

EPA Air Sensor Toolbox for Citizen Scientists