San Francisco Bay Area Network
The San Francisco Bay Area Vital Signs Network (SFAN) consists of eight NPS units, including Eugene O'Neill National Historic Site (NHS), Fort Point NHS, Golden Gate National Recreation Area (NRA), John Muir NHS, Muir Woods National Monument (NM), Pinnacles NM, Point Reyes National Seashore (NS), and Presidio of San Francisco. The parks of SFAN are within the central California coast range and are extremely diverse in natural resources and represent a unique set of management challenges with a relatively populated setting. Parks' air quality within SFAN are influenced by close proximity of urban and suburban populations. Pinnacles NM and Point Reyes NS are Class I air quality areas; all others are Class II air quality areas.
Point Reyes NS and Pinnacles NP have on-site air quality monitoring. Eugene O'Neill NHS, Fort Point NHS, Golden Gate NRA, John Muir NHS, Muir Woods NM, Point Reyes NS, and the Presidio are in ozone non-attainment areas.
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.