1.0 ISO19115_3 <p>CASTNET Site locations. Multipollutant air quality monitoring can be viewed and downloaded.</p> Active CASTNET Sites 2025 2025-01-25T00:00:00 -148.9676 -68.2608 63.723199999999984 25.391223 Air qualityambient measurementsambient monitoring Locations of current active CASTNET monitoring sites (2025) e78369eb7e95469a94713d472796f5ef US EPA https://services.arcgis.com/cJ9YHowT8TU7DUyn/arcgis/rest/services/Active_CASTNET_Sites_2025/FeatureServer