20260409 10461900 1.0 ISO19115_3 https://www.arcgis.com/sharing/rest/content/items/5290647c869c4c049fd2891eea5e6cba/info/thumbnail/ago_downloaded.png https://www.arcgis.com/home/item.html?id=5290647c869c4c049fd2891eea5e6cba Feature Service https://services.arcgis.com/cJ9YHowT8TU7DUyn/arcgis/rest/services/castnet_active_sites_09april26/FeatureServer 5290647c869c4c049fd2891eea5e6cba 20260409 10461900 <p><strong>Overview</strong></p><p>This feature service provides comprehensive geographic information on active Clean Air Status and Trends Network (CASTNET) monitoring sites as of April 2026. CASTNET is a national air quality monitoring network designed to collect data on atmospheric pollutants and deposition to assess long-term trends in air quality and environmental health.</p><p><strong>Feature Layer</strong></p><ul><li><strong>Active Monitoring Sites</strong>: This layer represents locations of active CASTNET sites. It includes details such as site name, agency responsible, sample start date, and links for additional information. Each site entry is geographically referenced with precise latitude and longitude values and includes the start date signifying when the site became operational.</li></ul><p><strong>Geographic Coverage</strong></p><p>The sites cover a broad range across the United States, facilitating regional and national analysis of atmospheric conditions across diverse environments.</p><p><strong>Use Cases</strong></p><ul><li>Environmental scientists and policymakers can use this data to monitor air pollution patterns and trends over time.</li><li>Researchers can leverage site information and spatial locations for environmental and public health studies.</li><li>Regulatory agencies can integrate this data for compliance monitoring and regulatory decision-making.</li></ul> Active CASTNET Air Quality Sites 2026-04-09T00:00:00 2026-04-09T00:00:00 2026-04-09T00:00:00 -148.9676 -68.2608 63.723199999999984 25.391223 1 air quality monitoringatmospheric depositionUnited States environmental dataenvironmental networkspollutant trends This service displays active CASTNET air quality monitoring sites as of April 2026 across the United States, providing detailed site information and spatial locations for environmental analysis. <p>NA</p> 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5290647c869c4c049fd2891eea5e6cba 2026-04-09 OAR Melissa Puchalski Scientist https://services.arcgis.com/cJ9YHowT8TU7DUyn/arcgis/rest/services/castnet_active_sites_09april26/FeatureServer Feature Service 1 EPSG