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Clean Air Status and Trends Network (CASTNET) - Beltsville, United States Environmental Protection Agency

posted on 2023-11-30, 08:43 authored by Jenny Jachim

CASTNET measures ambient concentrations of sulfur and nitrogen species as well as rural ozone concentrations. The network includes 90 sites located throughout the US and Canada. Each site measures weekly concentrations of acidic pollutants, base cations and Cl- using a 3-stage filter pack with a controlled flow rate. Most CASTNET sites also include a temperature controlled shelter and continuous ozone monitoring system.

Resources in this dataset:


U.S. Environmental Protection Agency


Data contact name

Jachim, Jenny

Data contact email


U.S. Environmental Protection Agency

Intended use

Results from CASTNET are used to report on geographic patterns and temporal trends in acidic pollutants, deposition and regional ozone concentrations. CASTNET is the only network in the US that provides a consistent, long-term data record of acidic dry deposition fluxes.

Temporal Extent Start Date



  • Not specified

Geographic Coverage


ISO Topic Category

  • climatologyMeteorologyAtmosphere
  • environment

Ag Data Commons Group

  • Lower Chesapeake Bay
  • Long-Term Agroecosystem Research

National Agricultural Library Thesaurus terms

sulfur; nitrogen; ozone; United States; Canada; pollutants; chemical bases; cations; chlorides; temperature; monitoring; dry deposition

Pending citation

  • No

Public Access Level

  • Public

Preferred dataset citation

Jachim, Jenny (2020). Clean Air Status and Trends Network (CASTNET) - Beltsville, United States Environmental Protection Agency. U.S. Environmental Protection Agency.