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Clean Air Status and Trends Network (CASTNET)

CASTNET is a national monitoring network established to assess trends in pollutant concentrations, atmospheric deposition, and ecological effects due to changes in air pollutant emissions. See the CASTNET overview fact sheet and the CASTNET Ozone Monitoring page for more.

What's New

  • The National Park Service established a new ozone CASTNET site in Carlsbad Caverns National Park, AZ in March 2021 (CAV436). 

  • In partnership with the Confederated Tribes of the Umatilla Indian Reservation (CTUIR), EPA established the 7th CASTNET tribal site in November 2020. The UMA009 CASTNET site is co-located with NADP/AMoN (WA04). 

  • In July 2020, the long-term site at Horton Station, VA (VPI120) was relocated due to the sale of the property. Sampling resumed on August 6, 2020 at a nearby location. The new site name is Blue Grass Trail but the site identification remains the same (VPI120). The co-located NADP/NTN and NADP/AMoN sites (VA13) were also moved to the new location at the Blue Grass Trail Station.

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