Southern Plains Network
The Southern Plains Vital Signs Network (SOPN) consists of eleven widely separated NPS units in Colorado, Kansas, Oklahoma, Texas, and New Mexico. The NPS units include Alibates Flint Quarries National Monument (NM), Bents's Old Fort National Historic Site (NHS), Capulin Volcano NM, Chickasaw National Recreation Area (NRA), Fort Larned NHS, Fort Union NM, Lake Meredith NRA, Lyndon B. Johnson National Historic Park (NHP), Pecos NHP, Sand Creek Massacre NHS, and Washita Battlefield NHS and are designated as Class II air quality areas. The SOPN Network is located in mixed grass and short grass prairie ecosystems that provide habitat for many rare species. All the park units contain significant natural resources.
The Network map below provides information on air quality monitoring. Ozone, sulfur dioxide, dry deposition, and meteorology are collected by the Clean Air Status and Trends (CASTNet) network. Ozone is also monitored with passive samplers and portable continuous analyzers. Wet Deposition is monitored through cooperation with National Atmospheric Deposition Program/National Trends Network (NADP/NTN). The Mercury Deposition Network (MDN), part of NADP, collects precipitation samples that are analyzed for mercury. Visibility is monitored as part of the Interagency Monitoring of Protected Visual Environments (IMPROVE). Additional details on these parameters are described in Air Quality Monitoring.
Air quality monitoring in or near the network is indicated on the map by symbols, with the blue line showing the approximate borders of the network. The legend shows the symbols for the type of monitoring present, with NPS park units in green.