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  2. Ambient Monitoring Technology Information Center (AMTIC)

Chemical Speciation Network (CSN) - General Information

Chemical Speciation Navigation
  • Chemical Speciation Network (CSN)
  • General Information
  • Measurements
  • Quality Assurance
  • Data Reporting and Validation
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Important Chemical Speciation Network (CSN) documents can be found below, including current sampling calendars, a master site list and historical documents from the beginning of the program.

  • List of CSN Sites Using National Contract for Analysis (pdf) (157.92 KB)
  • List of CSN Contacts (EPA and Contractors) (pdf) (116.26 KB, 03/20/2025)
  • 2024 CSN Sequential 1-in-3 Schedule (pdf) (1.92 MB, 11/20/2023)
  • 2024 CSN 1-in-6 Schedule (pdf) (292.35 KB, 12/07/2023)
  • Particulate Matter (PM2.5) Speciation Guidance - Final Draft (pdf) (211.05 KB, 10/7/1999)
  • Recommendations of the Expert Panel on the EPA Speciation Network Final Summary (pdf) (59.77 KB, 8/3/1999)
  • Data Quality Objectives for the Trends Component of the PM2.5 Speciation Network (pdf) (625.63 KB, 1998)
  • Strategic Plan Development of PM2.5 Quality System for CSN (pdf) (132.43 KB)

Ambient Monitoring Technology Information Center (AMTIC)

  • Basic Information
  • Ambient Air Monitoring Networks
  • Training and Conferences
  • Air Monitoring Methods
  • Air Monitoring Quality Assurance
  • Regulations, Guidance and Monitoring Plans
  • Program Review and Oversight
  • Networks, Partners and Programs
  • Related Links
  • Ambient Air Monitoring Listserv
Contact Us about Ambient Monitoring Technology Information Center (AMTIC)
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on November 18, 2024
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