Edgar Evans Air Monitoring Station, Smithville, Tennessee | CASTNET Site

Edgar Evans is an air monitoring station located within Edgar Evans State Park near Smithville, Tennessee, United States. It operates as part of the Clean Air Status and Trends Network (CASTNET), a national network designed to assess the effectiveness of emission reduction programs under the Clean Air Act. The station is operated by Mactec, Inc. and reports to the U.S. Environmental Protection Agency (EPA). As a CASTNET site, Edgar Evans measures key atmospheric parameters including ozone, sulfur dioxide, nitrogen oxides, and particulate matter, as well as meteorological variables such as wind speed and direction. The network follows rigorous quality assurance protocols aligned with EPA's Ambient Air Quality Monitoring Program. The station's location in a rural state park provides representative background air quality data for the region. The station contributes to long-term trend analysis of air quality and deposition, supporting regulatory compliance and scientific research. Its data helps assess the impact of emission reductions on ecosystems and human health in the southeastern United States. The continuous operation of this site ensures valuable time-series data for environmental monitoring and policy evaluation.

The station is situated in a rural forested area of Tennessee, providing baseline air quality measurements away from major urban or industrial sources. This siting is representative of regional background conditions, which is critical for understanding long-range transport of pollutants and the effectiveness of national air quality policies. The CASTNET network focuses on measuring criteria pollutants and atmospheric deposition, supporting the EPA's goals under the Clean Air Act and the National Ambient Air Quality Standards (NAAQS).