Pacific Island Network
The Pacific Island Vital Signs Network (PACN) consists of eleven NPS units including, War In the Pacific National Historic Park (NHP), American Memorial Park, National Park of American Samoa, USS Arizona Memorial, Kalaupapa NHP, Haleakala National Park (NP), Ala Kahakai National Historic Trail, Puukohola Heiau NHS, Kaloko-Honokohau NHP, Pu`uhonua o Honaunau NHP, and Hawaii Volcanoes NP. Spanning islands in the Northern Mariana chain, American Samoa, and Hawaii, the network encompasses an area as large as the continental United States. The islands, coastline, and near-shore marine areas that the parks encompass protect a wealth of the planets marine, aquatic, and terrestrial biodiversity, unique geologic features, historic sites, and cultures. Haleakala NP and Hawaii Volcanoes NP are designated as Class I air quality areas; the rest of the parks are Class II air quality areas. Visibility is monitored at Haleakala NP and Hawaii Volcanoes NP; in addition, wet deposition and sulfur dioxide are monitored at Hawaii Volcanoes NP. Air quality is not monitored in the other network units; because of the lack of nearby monitors, air quality estimates are not available and ozone injury risk assessments were not done for the network parks.
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) 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 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. Class I areas have linkable access to ARIS information.