World Data Centre for Precipitation Chemistry

Welcome to the World Data Centre for Precipitation Chemistry or WDCPC. This centre receives and archives precipitation chemistry data and complementary information from stations around the world. Data archived by this centre are accessible via connections with the WDCPC database. Freely available data from regional and national programmes with their own Web sites are accessible via links to these sites. The WDCPC is one of six World Data Centres in the World Meteorological Organization Global Atmosphere Watch (GAW). The focus on precipitation chemistry is described in the GAW Precipitation Chemistry Programme. Guidance on all aspects of collecting precipitation for chemical analysis is provided in the GAW Guidelines for Precipitation Chemistry and Deposition Measurements.

The datasets associated with the global assessment of precipitation chemistry and deposition can be found here:

Please contact if you have data that meet the guidance in WMO-GAW Report 160 and could be added to the WDCPC archive.

The WDCPC is closely linked with the Quality Assurance/Science Activity Centre – Americas (QA/SAC-Americas), which helps to ensure and document data quality at precipitation chemistry laboratories. Graphical and tabular summaries on the QA/SAC-Americas Web site enable researchers and other users to assess the quality of data suitable for their applications.

To enhance geographic data coverage, the WDCPC maintains close cooperation with a number of regional precipitation monitoring programmes, including:

Please contact, if there are publicly available, quality assured, data that meet GAW precipitation chemistry programme standards but are not accessible through the WDCPC.