Address: 1 Black Cat Drive
Herculaneum, MO 63048
County: Jefferson
Pollutant monitored: Lead (Pb)
Pollutant formerly monitored: Sulfur dioxide (SO2)
For more information, go to
Date established: Jan. 1, 1968
Site coordinates
* Latitude: 38.26703°
* Longitude: -90.37875°
EPA Site Nos.: 29-099-0005 and 29-099-9002

The state of Missouri and the Doe Run Co. both operate air monitoring stations on the roof of Herculaneum High School, which is part of the Dunklin R-5 School District. These sites and several others monitor airborne lead near the Herculaneum primary smelter that closed in 2013. Doe Run now operates a refinery and strip mill as well as alloying and casting operations in Herculaneum. The monitoring stations at the high school track the exposure of students to airborne lead. Monitoring for lead first occurred here in 1968, making it one of the most established locations for ambient air monitoring in the state.

Lead (Pb) Data*

The primary and secondary ambient air standards for lead have remained at 0.15 micrograms per cubic meter (µg/m3) since 2008. The primary standard reflects EPA’s concerns for public heath while the second standard shows concern for public welfare. EPA bases the standard on the highest rolling three-month average over a period of three years and two months. A monitoring site meets the standard when this rolling three-month average is less than or equal to 0.15 µg/m3.

Preliminary lead data

· Information about 2008 standard and EPA requirements
· Three-month average lead concentrations for the most recent 12 months
· Map of lead monitoring sites

Trends in design values for state-operated sites in the Herculaneum area, 2004-2017
• Note the inclusion of a site at the high school on both this graph and the graph, below, for industry sites. Both the state and Doe Run operate stations on the high school's roof.

Trends in design values for industry sites in the Herculaneum area, 2004-2017
• Note that design values for air monitoring stations at the high school appear on both this graph and the one for state-operated sites, above.

Department’s webpage about airborne concentrations of lead
· Description, health effects and historical information
· 2008 standard and related documents

Related Links

Missouri map with network of air monitoring sites

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

Department’s webpage about air quality

· Air quality forecasts for St. Louis, Kansas City and Springfield during ozone monitoring season

· Tips for improving air quality
Tips for breathing better when air quality is forecasted to be heathy for sensitive groups (orange) to unhealthy (red)
Air quality forecasts for major U.S. cities
· Air quality information from EPA

National standards for pollutants

EPA Air Sensor Toolbox for Citizen Scientists