QA/SAC - Americas

LIS70 is now closed. Results can be found under the 'Study Results' tab.

Thank you to all of our participating laboratories!

LIS71 will be announced this fall.

If you do not currently participate in our program and wish to sign up for the next Laboratory Intercomparison Study, please contact us at manager@qasac-americas.org.

This program is free to all participants, and is open to any laboratory analyzing wet deposition samples.

Updated: Feb 11, 2025 UTC

Welcome to the Quality Assurance/Science Activity Centre – Americas (QA/SAC-Americas), one of five QA/SACs operating to ensure data quality and support science activities in the World Meteorological Organization Global Atmosphere Watch (GAW).

The QA/SAC-Americas seeks to document and help improve the quality of precipitation chemistry measurements from around the world. It conducts semi-annual inter-laboratory comparison studies. Graphical and tabular results of past studies are available by accessing Study Results.

Guidance on all aspects of collecting precipitation for chemical analysis is provided in the GAW Guidelines for Precipitation Chemistry and Deposition Measurements.

Visit the World Data Centre for Precipitation Chemistry Website for information about the Global Assessment of Precipitation Chemistry and Deposition.

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