Address: 210 Glennon Heights Road
Crystal City, MO 63019
County: Jefferson
Pollutant Monitored: Lead (Pb)
Date established: Jan. 1, 2010
Site Coordinates
* Latitude: 38.243°
* Longitude: -90.37372°
EPA Site No.: 29-099-0025

The department established the Ursuline North air monitoring station to measure the background concentration of airborne lead upwind of Herculaneum. Until 2013, the Doe Run Co. operated a primary lead smelter in Herculaneum, and today in Herculaneum, Doe Run operates a refinery and strip mill as well as alloying and casting operations. The state of Missouri has operated this air monitoring site since 2010; it's located near a shuttered Roman Catholic convent for religious sisters of the Ursuline order.

Lead (Pb) Data*

The primary and secondary ambient air standards for lead have remained at 0.15 micrograms per cubic meter since 2008. The primary standard reflects EPA's concern for public health while the second standard demonstrates 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

Trends in design values for industry sites in the Herculaneum area, 2004-2017

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

2009 Monitoring Network Plan
• Describes the expansion of the state-operated lead monitoring network prompted by EPA requirements issued in 2008

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 season: March 1 through October 31
• Tips for improving air quality
• Tips for breathing better when air quality is forecasted to be unhealthy for sensitive groups (orange) or unhealthy (red)
• Air quality forecasts for U.S. cities
• Air quality information from EPA

National standards for pollutants

EPA Air Sensor Toolbox for Citizen Scientists