Chemical Speciation Network (CSN) - General Information
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Speciation Network (CSN) documents can be found below, including current sampling calendars, a master site list and historical documents from the beginning of the program.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)
- List of CSN Contacts (EPA and Contractors) (pdf)
- 2024 CSN Sequential 1-in-3 Schedule (pdf)
- 2024 CSN 1-in-6 Schedule (pdf)
- Particulate Matter (PM2.5) Speciation Guidance - Final Draft (pdf)
- Recommendations of the Expert Panel on the EPA Speciation Network Final Summary (pdf)
- Data Quality Objectives for the Trends Component of the PM2.5 Speciation Network (pdf)
- Strategic Plan Development of PM2.5 Quality System for CSN (pdf)