Northern Great Plains Network
The Northern Great Plains Vital Signs Network (NGPN) consists of 13 NPS units in North and South Dakota, Nebraska, and eastern Wyoming. The parks include cultural, historical, and natural areas, with landscapes typical of the Great Plains. Three of the parks, Badlands, Theodore Roosevelt, and Wind Cave National Parks, are designated Class I air quality areas; the rest of the parks are Class II areas.
Several of the Network parks have on-site ambient air quality monitoring, and in most cases, there are nearby monitors.
The Network graphic below provides information on air quality monitoring. Ozone, sulfur dioxide, dry deposition, and meteorology are collected by the Clean Air Status and Trends (CASTNet) and Gaseous Pollutant Monitoring (GPMN) networks. 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 graphic 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. Class I areas have linkable access to ARIS information.