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Speciation Network (CSN) documents can be found below, including current sampling calendars, a master site list and historical documents from the beginning of the program.
You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.- List of CSN Sites Using National Contract for Analysis (PDF)(4 pp, 162 K)
- 2021 CSN Sequential 1-in-3 Schedule (PDF)(13 pp, 196 K, 01/05/2021)
- 2021 CSN 1-in-6 Schedule (PDF)(13 pp, 189 K, 01/05/2021)
- Particulate Matter (PM2.5) Speciation Guidance - Final Draft (PDF)(70 pp, 216 K, 10/7/1999)
- Recommendations of the Expert Panel on the EPA Speciation Network Final Summary (PDF)(16 pp, 61 K, 8/3/1999)
- Data Quality Objectives for the Trends Component of the PM2.5 Speciation Network (PDF)(25 pp, 641 K, 1998)
- Strategic Plan Development of PM2.5 Quality System for CSN (PDF)(15 pp, 136 K)