The goal of IADN Data Viz is to provide easy access to air monitoring data collected as part of the Integrated Atmospheric Deposition Network (IADN).  IADN is a long-term monitoring program run by the U.S. Environmental Protection Agency’s Great Lakes National Program Office. IADN and Environment and Climate Change Canada’s Air Monitoring in the Great Lakes Basin (GLB) program form a collaborative binational monitoring network that has been in operation since 1990.

IADN has been measuring the concentrations of persistent toxic chemicals in Great Lakes air and precipitation since 1990. Since that time, over a million measurements of the concentrations of PCBs, pesticides, PAHs, flame retardants, and trace metals have been made. The measurements are used to (i) determine the spatial and temporal trends of toxic chemicals in Great Lakes air; (ii) estimate the atmospheric loadings of the toxic chemicals to the Great Lakes; and (iii) identify sources and/or source regions. IADN is also used to discover new emerging chemical threats to the Great Lakes.

This website contains data from seven stations: two on Lake Michigan, two on Lake Erie, one on Lake Ontario, and two on Lake Superior. Most of the sites are in rural or remote areas except for sites in Chicago, Illinois and Cleveland, Ohio.  The data presented have been collected by Indiana University under a cooperative agreement with EPA.