2020 Quality Assurance Reports are now available

The 2020 Quality Assurance Reports (QAR) for the CAL, HAL, and AMNet are available here. View

2020 Annual Summary is now available

The 2020 Annual Summary is now available on the website. It can be accessed here. View

New Website

The new NADP website is now live. We look forward to any feedback, comments, or suggestions. As well if there are any links that are not working, please report them to us by sending an email to   Technical subcommittee and science committee can submit updates, documents, and changes to the Program Office for […] View

In Memoriam – Ellis B. Cowling (1932-2021)

Ellis B. Cowling received a B.S. in Wood Technology from State University College of Forestry at Syracuse University in 1954, a M.S. in Forest Pathology from Syracuse in 1956, and a Ph.D. in Plant Pathology and Biochemistry from the University of Wisconsin in 1959. He received a Filosofie Doktor (Ph.D.) in Physiological Botany from the […] View

Operator Training Session #5

The next training session will be held virtually on Monday November 8, 2021 at 15:00 EST/14:00 CST/13:00 MST/12:00 PST. The topic will be NTN Bag Sampling – 1 year in: The good, the bad, the ugly The format will be a brief presentation followed by a Q&A session. The Q&A is an opportunity for operators […] View

Operator Training Session #4

The next operator virtual training session is scheduled for Monday October 4, 2021. The topic will be “Equipment Winterization”. In order to prevent damage to your equipment, it should be prepared for the winter season. This training session will cover the NTN and MDN collectors, the raingages, and AMoN shelters. As well there will be […] View

Save The Date! 2021 NADP Fall Meeting and Symposium

The dates for the NADP 2021 Fall Meeting have been set for October 25-29, 2021. Please note that we are planning for virtual meeting.  Meeting information is available on the website. View flyer. View

Operator Training Session #3

The next operator virtual training session is scheduled for Monday June 14, 2021. The topic will be “Is Your Site Impacting your Data?”. Approximately every 4 years sites are surveyed by EEMS to assess siting criteria, equipment and operator performance. A number of issues at your site could be impacting the quality of your data. […] View

Sample Archive Disposal

The NADP Central Analytical Lab will begin disposal of NTN, AIRMoN and AMoN archived samples which have exceeded our sample retention policy. The following samples are available prior to disposal: NTN Archive Samples: 10 to 60 mL filtered precipitation (stored at 4°C); Samples from 2014 and 2015 AIRMoN Archive Samples: 10 to 200 mL unfiltered […] View

Notice regarding pH data from June 1, 2018 through February 4, 2020

Notice regarding pH data analyzed from June 1, 2018 through February 4, 2020. This includes NTN sample IDs TT0001SW-TV1558SW and AIRMoN samples AE001L-AE0769L. This pH data set may have a slight bias due to the use of an incorrect pH meter calibration curve. All quality control samples associated with pH analysis during this timeframe met criteria (unless qualified […] View