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NTN Data Retrieval Options

NTN data are available for a variety of time periods and formats. Start by selecting from the following options:

Select data from a single site using a site list. or interactive map

Retrieve data from all sites

Data users please note: The CAL analytical bromide (Br) method has been modified and applied to NTN and AIRMoN samples collected after June 1, 2018. Be advised that all NADP bromide data are currently under review (including samples collected both before and after June 2018). Please check this site for additional updates during the remainder of this year. Specific questions about bromide should be directed to Dr. Martin Shafer at: mmshafer@wisc.edu. For all other data questions, please contact Robert Larson at Robert.Larson@slh.wisc.edu