QA/SAC - Americas

Laboratory Intercomparison Study 62 (LIS62) has shipped.

Please contact when you recieve your samples.

Please enter results using the Lab Manager Login below. This YouTube video describes the steps:

If you cannot access the Lab Manager Login website, results can be entered into this Excel spreadsheet and emailed to

Updated: Oct 06, 2020 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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